You have a point. But the question becomes, why isn’t the fediverse doing the same? To the best of my knowledge, lemmy and mastodon relies on user initiatives with no organized effort to grab as many users as possible (not to discredit the extreme overtime that admins of lemmy.world are doing).
Other instances are doing the opposite, closing registrations left and right or making it harder by requiring multiple essays and job-like interviews as barriers for entry.
Sorry if I sound a little bit frustrated but i sincerely believe that this is a perfect opportunity to cast fediverse and open source into the mainstream and genuinely compete with corporate and commercialized platforms.