Well, businesses have been making political statements for centuries. Let's not forget that Citizens United gave them the same First Amendment speech rights as people. And just how much money are your local politicians taking from corporations? They make political statements and decisions EVERY DAY.
Yes, maybe 20-25% of AirBnB hosts probably agree with the decision, but that is not going to hamper the other 75-80% of hosts to open their properties to women that are being forced to basically be refugees to leave states to find medical/abortion care. Don't join the group. Do your own thing. Being part of AirBnB is a choice. There are other services you can use to rent your space if you don't like it.
And those guests... if the polls are correct, more are in favor of keeping Roe intact than not. Most say 3 in 4 would have left it in place. It's my property and if I decide to make a political statement with it, I will. And if someone doesn't want to stay in my property because I'm gay, liberal, and not in favor of forcing 13 year old rape victims to carry a pregnancy to term, I do not care. I don't want their money.