I've just signed up for access to MakerTube but yeah I agree, most Instances won't be able to host 5+ years of content from users making rather the user or the instance to rather have to delete the content or the user to create a 'second' channel to upload more. Hopefully with time, storage get's better and easier but quality of video files (and there for size) will most likely grow so it's really a cat and mouse game.