@Sean95 Try doing a search here for this topic. There are several threads on this. Yes, many hosts are asking for vaccine proof and stating that they only accept vaccinated guests.
As a home-share host myself, whose guests share my kitchen, I actually have had my calendar blocked to bookings since March 2020 as I am not willing to risk getting this virus, and luckily I have another job, so I can do that and still pay the bills.
I plan to open to bookings again in the next couple months, and I will most definitely only accept vaccinated guests.