When excalidraw was mentioned in another comment I think it would also be worth to mention tldraw even though I don’t kniw whether it can be counted as an replacement since I never used draw.io.

https://github.com/tldraw/tldraw

On Android, from FDroid you can install an app called Seal

I like ytdlnis more.

deleted by creator

LibreTube

AFAIK Opera has some kind of patent for this, so other browsers cannit implement it so easily.