Airbnb (ABNB 0.77%) has been one of the great post-pandemic winners in travel. With its global brand, durable free cash flow, and ambitions to build an "everything app," it's easy to see why the stock has drawn investors' interest.

But no growth story comes without risks. For Airbnb, three stand out as the most pressing for investors: tightening regulation, margin pressure from new initiatives, and a valuation that leaves little room for error.

A person getting into the back of a car.

Image source: Getty Images.

1. Regulatory pressure is escalating

Airbnb's most significant long-term risk isn't competition -- it's regulation. Governments around the world are clamping down on short-term rentals as they grapple with housing shortages and affordability issues.

In Spain, courts ordered Airbnb to remove more than 65,000 listings, one of the most aggressive crackdowns yet on the platform. In France, a court required Airbnb to pay over 8 million euros in tourist tax compensation -- a precedent that could invite similar claims elsewhere. And in the U.S., cities like New Orleans have passed stricter laws requiring platforms to verify listings, prompting Airbnb to sue in response.

Each of these cases highlights the same issue: Regulators view Airbnb as a contributor to rising rents and limited housing supply. That perception isn't going away. While the company has worked to improve compliance and partner with cities, the possibility of more listing removals, fines, and restrictions remains high.

For investors, the concern is twofold. First, reduced supply in major tourist hubs could limit growth. Second, compliance costs and legal battles could weigh on profitability.

2. Margin pressure from the expansion of new services

In response to challenges in its rental business, Airbnb is pushing hard to diversify into new services, backed by a $200 million investment and a redesigned app. The pitch is that Airbnb should become more than a place to book stays -- it should be a full travel companion.

While such a strategy makes sense, it opens up a new problem for the tech company. These new businesses are tough to scale profitably. Experiences are operationally intensive, require vetting local hosts, and generally come with much thinner margins than the core rental business.

Airbnb's core accommodations business is asset-light, scalable, and highly profitable. Adding lower-margin services risks diluting that model, at least in the short term. If management spends heavily to build out services without showing clear traction, it could drag down earnings just as competitors like Booking and Expedia double down on their strengths.

For investors, the key is whether Airbnb can translate Experiences into an actual ecosystem driver -- lifting retention and average revenue per user -- rather than a costly side business. Until then, potential margin compression remains a real red flag.

3. A premium valuation

The third risk is straightforward: Airbnb stock isn't cheap. As of this writing, it trades at a price-to-earnings (P/E) ratio of 30 times. That pricing assumes Airbnb will continue to grow while maintaining its margin over time.

On the one hand, it makes sense for the growth stock to trade at a premium, given the massive opportunity in the global travel industry, estimated to reach $1.4 trillion by 2030. Still, investors should not ignore the potential challenges ahead for the company, such as regulatory issues, competition, and potential margin compression as it diversifies into services and experience.

If Airbnb's growth slows while costs rise, that premium multiple could come under pressure quickly. Investors don't need to look far back in history to see what happens when richly valued growth stocks disappoint -- the 2021-2022 drawdown in tech offered plenty of cautionary tales.

What it means for investors

Airbnb has a lot going for it: it's profitable, owns a powerful brand, and is well positioned to grow thanks to the opportunities in long-term stays, international expansion, and platform monetization.

But investors should keep three red flags firmly in view:

  • Regulation threatens supply in key markets.
  • Margin pressure looms as Airbnb expands into lower-return services.
  • Valuation remains elevated, leaving little margin of safety if growth slows.

None of these risks is fatal on its own, but together they highlight why Airbnb isn't a "set it and forget it" stock.

Long-term investors should watch how management balances growth ambitions with regulatory compliance and profitability. Execution will be the difference between Airbnb living up to its premium valuation -- or falling back to earth.