With the money came the greed, the over-polished mass market content, and the ecosystem of creators is now mostly driven by engagement.
Not to mention all the topics that have been soft-banned because one algorithm flags those videos as not monetizable, and the next algorithm decides that only showing or recommending videos that can show ads results in the most add revenue
I don't think YouTube is clearly better or worse than it was before acquisition, and maybe an independent YouTube would have walked the same path. It is simply a very different platform that was ship-of-theseusd