can i make these, since technically these are your ideas, i am definitely interested in lemmy_check. I believe lemmy_know is very close to c/ask
For those who are want something similar to invidious, you can try youtube-local (not my project, I am just a user). It is a minimal python youtube client, and functions similar to other frontends, but runs locally. You lose some amount of privacy (youtube still has a general idea of who is watching with IPs), but it is not very exact, and there is an option to use tor to get the content. You can also enable sponsorblock, or hide yt-shorts.
Have considered recrystallisation therapy
I agree, those are just 2 examples of people doing fact finding, idea is someone will post something, and other lemmings will do what people in the video did