A non -technological way to give negative feedback to Twitter/X is to stop using it, even "just reading an occasional post". Continuing to read things on it, even through Nitter, is in the interests of Twitter/X and of the people who continue to support Twitter/X by posting there. Tell the people who use it no. The decent people won't hear them on Twitter/X, and the decent people will wonder what's wrong with them if…
The Twitter HQ had always fought its userbase and culture, not always relentlessly with passion, but never really loved it. The relationship between Twitter, Inc. and its user hivemind was always Clockwork Orange toxic. Though Musk trying to ruin it and getting his brain absolutely deep fried in a massive brain inflammation is his own doing, Musk ending up owning it in the first place, for the large part, is result of its former owners throwing in the towel.