With its S-1 filing finally made public, Snap Inc. (NYSE:SNAP) is close to selling shares to the public for the first time. The company, known for its wildly popular Snapchat app, is expected to raise around $3 billion and be valued in the ballpark of $25 billion. Snap only started running ads in late 2014, producing just $404 million of revenue last year. If a price-to-sales ratio above 60 doesn't scare you away, here are two more reasons to stay far away from this hyped-up IPO.

Revenue growth means nothing

Snap grew its revenue by nearly a factor of eight between 2015 and 2016. That growth is what has investors excited, but it's really not as impressive as it seems. User growth drove a portion of this increase, with daily active users jumping from 50 million in early 2014 to over 150 million today. But the ramping of ads, from none in late 2014, was the main driver.

If you take any ad-free platform with daily active users measured in the tens or hundreds of millions and start showing ads, revenue is going to explode no matter what. A monkey could be in charge of Snap's ad business at this point, and the company would still be posting incredible revenue growth.

A smartphone showing Snapchat's discover feature.

Image source: Snap Inc.

The real challenge is to generate enough revenue to cover costs and turn a profit while not driving users away with excessive advertising. Facebook nailed it. Twitter (NYSE:TWTR), which was once putting up its own explosive growth numbers, has failed miserably. Twitter's annual revenue surged from just $28 million in 2010 to $2.53 billion in 2016. That's a 90-fold increase. But costs have exploded as well, leading to massive losses each year, along with a crumbling stock price.

Snap's revenue growth so far proves nothing. The company is losing even more money than Twitter was when it was generating a similar amount of revenue prior to its IPO. Twitter lost $79 million on $316 million of revenue in 2012. Snap lost a staggering $514 million on $404 million of revenue in 2016.

Snapchat's daily active user growth has already started to slow, with the company adding just 5 million new users globally during the fourth quarter, down from a gain of 10 million during the third quarter. Growth could certainly reaccelerate, but it's possible that the company is already approaching its ceiling, much like Twitter has done. There's plenty of room to grow revenue per user, but if that growth is accompanied by exploding costs, Snap will end up just like Twitter.

Public in name only

Snap will be the first U.S. IPO offering only shares with no voting power at all. Other tech companies like Facebook have share structures that leave the founders with an outsize percentage of voting power relative to their ownership stake. But Snap isn't even putting up a facade.

Those who buy into the Snap IPO likely won't care as long as the company and the stock perform well. You don't need voting rights when everything is going great. Problems only arise when the situation turns south. Snap warned potential investors in its S-1 filing about the risks associated with this structure:

This concentrated control could delay, defer, or prevent a change of control, merger, consolidation, or sale of all or substantially all of our assets that our other stockholders support. Conversely, this concentrated control could allow our co-founders to consummate a transaction that our other stockholders do not support. In addition, our co-founders may make long-term strategic investment decisions and take risks that may not be successful and may seriously harm our business.

Having a long-term focus is important for any company. But having no check whatsoever on the two co-founders, CEO Evan Spiegel and CTO Robert Murphy, is a disaster waiting to happen. Here's another line from the S-1 filing:

If Mr. Spiegel's or Mr. Murphy's employment with us is terminated, they will continue to have the ability to exercise the same significant voting power and potentially control the outcome of all matters submitted to our stockholders for approval.

In other words, both Spiegel and Murphy will enjoy a lot of job security, and management with no accountability doesn't seem like a good idea to me.

If there was ever an IPO to avoid, this one is it. A euphoric valuation, a completely unproven business model, and a structure that gives ordinary shareholders no voting rights at all... invest at your own peril.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.