In some ways, highly controversial content is worse than illegal stuff. If you’re running a forum to buy/sell stolen credit cards or a “stresser” DDoS service, you only have to worry about a court order. But if your site knowingly hosts racists banned from other platforms, one of your users goes out and has himself a massacre, and you decline to clean up your act, you may find yourself being dropped by upstream providers.
So it might be that even “bulletproof” providers wouldn’t touch Gab, now that their users jumped past being assholes and into mass murder. Then only Tor remains. Tor is way too slow for interactive browsing or downloading files, but would work perfectly fine for a Twitter clone.