Just by googling "twitter api" I am able to find an "unofficial API" (scraped, obviously), that gives you access to tweets for around $0.15/1k tweets. Which is expensive if you want to, let's say, train a model, but super cheap for a casual user.
A nice UI around such API probably can be one-shotted with modern LLM-coding models and tools.
Or, you can go the hard way and vibecode something around buying twitter accounts (just several bucks per each) and proxies.
What I'm trying to say, that with modern tools it is incredibly easy to bypass the restrictions on reading twitter without an account, even if they manage to take down all the nitter instances, try to make finding nitter source code harder etc.