Alphabet as a whole is an organization built by the immense money that comes from monopolizing digital advertising (through some very... unscrupulous means) and then run by people deluding themselves into thinking they can do anything else. There's a reason everything is "killed by google" - I'm not exactly sure anyone there knows how to do damn near anything that isn't propped up by investor hype and the money they make from ads and other strictly profitable ventures such as GCP. Alphabet only has the ability to do immensely stupid things because their core business gives them damn near infinite money to play with.
You are 100% correct in that ads are the ONLY thing propping up google as a business. This is probably a very bold prediction, but I think that when money starts getting more expensive, when rich billionaires are more reluctant to just throw money at inane, borderline speculative bullshit, there will be a massive hemorrhaging of unnecessary business. And maybe this is a little out there but... you know how YouTube doesn't actually make any fucking money?
Interesting things to think about for sure.