FOSS front ends like Nitter provide a RSS feed for Twitter feeds. Invidious for YouTube and Teddit for Reddit also work, though the original sites in this case still provide their own RSS feeds.
The point of Nitter is that it uses the API their official web client (which is a JS SPA) is using. They can't lock out Nitter without also locking their own frontend out.
They seem to be pretty stable when it comes to their APIs. Over 5 years ago I built a small service to provide your personal Twitter main timeline as an RSS feed. Never touched it since. Still works.
