Google has investors though. Telegram is wholly owned by Durov.
I've also seen him run monetization at VK. Basically: there was one developer responsible for ads, and he sat in another office together with financial staff because of the different values.
Re:Telegram's getting ads
by onetimemanytime on Wednesday December 23, 2020 @04:48PM
(#25522618)
Now he doesn't.
The Google founders were pretty idealistic when they started too and no doubt many swore by their intentions.