Just checked it. It was actually Twitter that was down and not the Nitter instances. It is still a bit flaky but so is Twitter itself right now.

After a bit more testing and one full day of evaluation Wikiless is now restored. The aggressive caching didn't really help. I added Anubis on top of Wikiless and after a few minutes it completely removed the rate limit on the back-end. Meaning JavaScript is now required for Wikiless but the barrage of bot requests gets filtered out. In my opinion a fair trade off. Shoutout to Anubis. This software is incredible at stopping bots/scrapers https://github.com/TecharoHQ/anubis

Regarding Invidious: YouTube is currently A/B testing disabling DASH. Invidious uses DASH for the video streams. YouTube wants their in-house protocol, SABR, to be the new default. Some mitigations are now in place to get DASH back but consider Invidious unstable for the foreseeable future as YouTube will likely disable them sooner or later as well. https://github.com/iv-org/invidious-companion/issues/60