import re
text = "Here are my favorite things: crypto.com, polo.com, cryp.com and google.com"
print( re.sub(r'\s*\b(?!crypto\.)\w+\.com\b', '', text) )
aW1wb3J0IHJlCnRleHQgPSAiSGVyZSBhcmUgbXkgZmF2b3JpdGUgdGhpbmdzOiBjcnlwdG8uY29tLCBwb2xvLmNvbSwgY3J5cC5jb20gYW5kIGdvb2dsZS5jb20iCnByaW50KCByZS5zdWIocidccypcYig/IWNyeXB0b1wuKVx3K1wuY29tXGInLCAnJywgdGV4dCkgKQ==