Normally, if there is sufficient evidence, both the mob boss and the ground level gangster are liable and criminally responsible for their crimes. You are free to disagree, but I don't see any reason why big tech companies should be completely immune from any and all responsibility for facilitating and taking a cut of the criminal activity taken on their territory.

You are also free to call it censorship, but I am not aware of any jurisdiction where fraud is considered protected speech, so as far as I'm concerned, censor away baby.