My boys have chromebooks, it’s almost mandatory for school now, and I get why teachers need the whole class to have a similar locally-networked tool. Problem is we as parents can't set anything, as we don't have 'developer' access, and the school controls their accounts. So at home, they do stupid stuff. The hardware is ok, I wish it was just linux. About what google gets - I doubt the current data is so valuable, they play a long game hoping to lock young people into their ecosystem, to profit from people with cash/energy in their 20s.
I don't buy this. I'm still using SMTP on my own domain and it’s working fine, a bit of spam but not unmanageable, real messages get read. Main challenge is digesting so many potentially-interesting list messages, indicating email's continued dominance for professional topics. Seems this author has another agenda.
Having said that, it's a pity the world never agreed a protocol for micro-payment for emails (and for many other services), which would resolve the spam problem, and not be a burden for honest users.