You're missing one super obvious option. And this option is TikTok. All the short funny videos are there right now. Just learn how to use hashtags in search and you will find all the videos you need. TikTok even allows downloading videos. There's one downside though: watermarks. But it is easy to fix. Just use this website https://qload.info/ . You don't need anything else.
Hi. I have a youtube channel where I upload different compilations. I used to get all the videos from 9gag, 4chan, and Reddit. But it seems like these rivers dried up. Maybe there're some other websites?