Centralisation and large scale has it’s benefits. There were also many problems with everybody hosting their stuff by themselves. Enshittification is results of private companies having to go profit first (and google being google of course), not so much because they are the only game in town. Being the monopoly merely enables the shitting on users for profit. I see youtube and many google services more like internet’s utilities that are privately owned and that is causing problems, not that they have gotten so big.