Yep. Too many scams and in crypto there's no possibility for charge back either.
Hence the big sites have scripts that check for crypto addresses. This was most advertised in Twitter (after that big Twitter scam), but I see FB is no different.
Keep in mind that you are putting content onto their site, not yours. Make your own site and you'll have your rules. Or, as @mk4 said, make one page for donations purpose and link to that.