I recently started running a peertube instance at https://battlepenguin.video I don't have a lot of stuff on YouTube/Vimeo and none of it has ever gotten a lot of views, but I am in the process of uploading old videos to my peertube instance and changing all the embed blocks on my website to show my peertube video instead and just have YouTube and Viemo below it as Links under a section labelled "Mirrors" on each of those posts.

For big content creators that depend on the ad revenue, I realize it really isn't practical to mirror everything on PeerTube. Even if you know how to run your own peertube server and keep up with security updates, now you're eating into your own ad revenue (with the advantage of keeping your videos online in case the YouTube robots and/or gods decide to take down your channel).

It's a double edge sword, but I hope more content creators will mirror their videos on services they pay for and have more control over.