That would indeed be interesting to see. Who knows, it might crash everything after all. From what I have seen, it might play out favourably.

I had noticed this channel when browsing the "most watched of all time" list, I have no idea about them and their content, as I don't speak their language, but I assume they probably chose PeerTube as an (additional?) hosting option for content they already had an audience for (seemingly from YT?), probably embedding their videos on an external website with a following?

Any way, back then (the numbers are misleading, btw, because the x years ago lists from the originally-published date, not the date-uploaded), they seem to have garnered thousands of views, so probably easily hundreds of viewers simultaneously. The interesting part: The server they uploaded on has the technical info listed, and that reads very much "laptop at someone's private home".

Unless the numbers have been fudged - which I will grant, is always a possibility - that bodes well for any hosting that's done even just a bit more professionally. It should be able to relatively easily scale up even to thousands concurrently, again, if those numbers aren't doctored. And it makes sense, at least to me - downloading torrents has worked like that for a long time now, too - even for torrents that aren't "professionally" seeded with dedicated servers.