Oh yeah, I like those prompts and participate in them too. The ones I posted through those prompts bumped my view and follower counts. I'm still trying to figure out the video post that will become viral :D
I can really see an algorithm at work though. The way it instantly kills off a video's exposure. Even the ones that do good don't gradually lose interest, it's like they hit a wall. But I guess the more you post and gain followers, you climb above that wall and see higher views
I did a bit of search about it and what I gather so far is that the algo will push your post to 200-300 viewers and the what happens next depend on the reaction you'll get from those initial viewers. If your post gets like or commented or shared then it will get viral.