So I suspected this for a while but I finally confirmed it - I was shadow banned; to my understanding this is likely because I opened a bot (commands on @mention) account with same mail/phone or whatever.
This is worst than actual banning. I've been living in the shadows for who knows how long.
Recently I gained some momentum - one of my threads (same handle, @high_byte) got relatively viral and I doubled my followers overnight. (from 300 to almost 600 lol)
But still I am invisible to the world. support@twitter.com auto-replies with basically "we don't answer via email". Their support page has only Q&A and no contact information. This should be illegal!
What can I do?
Anyways, I sympathize - I think generating outrage on HN is about your best option. But let's not talk about illegality here, it's still a free service. You're not going to get free human time from any other kind of company, so why should internet companies give it to you?
You put too much personal value on a free social media website that has no obligation to its users.
> What can I do?
Stop using Twitter.
Having a Twitter bot is hard due to that exact reason: Even if you are using the API in the way Twitter intended, they will shadow ban your account if you are tweeting a lot of tweets with similar content.
That was my experience with developing bots for Twitter, however my main account didn't get shadow banned, only the bot's account.
When Elon Musk started to purchase twitter I checked again and all 3 weren’t shadowbanned anymore.