*Deliberately chooses Amazon as their hosting provider, the most Big Tech one among countless options*

"Yeah we're against Big Tech."

*Amazon decides to enforce its terms of service*

"Ahh censorship, look how Big Tech can just kick you off the internet if they don't like you."

AWS is not the internet.
AWS is not even close to being any kind of monopoly.
There's a million hosting providers, and you violated the ToS of the one you chose.