AirBnb has one dark pattern that I'm aware of, that I absolutely despise: the search listings don't display the actual price, but instead the price minus the fees (so not what you'll actually pay). Thankfully some jurisdictions made this illegal (e.g. if you use the Australian AirBnb website you'll get the actual prices), but it's a horrible pattern presumably designed to get people to commit to initiating a booking and thus less likely to not proceed when they see the final total.

I have zero faith that anyone who was okay with that should be in charge of anything for the public good.