I imagine it might be easier to make some niche profit in Cloudflare's business. Not so sure with Twitter, partly because Twitter itself isn't profitable, but also because the main feature of social media services is their ubiquity and userbase. Even if Voat were decidedly a better site than Reddit, it just wasn't that interesting to revisit a sparsely populated discussion site. Especially one weighted toward folks who wanted to discuss the things that Reddit wanted to ban.
I'm not so sure about that - I recall having much better experiences when these sites were much smaller. Something about eternal september.
The issue becomes more severe when it runs up against services that are hard or expensive to start or which rely on other uncooperative services - look at what's happened with Daily Stormer and Bulletproof.ai for example - Bulletproof wants to provide them service, but they're unable to find a TLD thus far which will allow their domain to stay online.