I've always wondered about this. What happens if one of the big tech companies makes a mistake and closes your account? LinkedIn is pretty important nowadays when searching for work. Would you be able to make a new account? If not, that seems like a pretty big deal. Same concern with your email, or any of the other big services that we usually depend on. If I just suddenly lost my gmail, I would probably lose access…
You are right though, it can be crippling, and this thinking part of your personal (and business) risk profile. Ideally your email is at least tied to a domain name you separately own. That way, if your Google/MSFT/Apple/whatever account gets blocked, you can switch over the email to another provider and still get access.
* edit to add: I don't know if this is more a Google thing than other companies, I was just heavily invested in the Google ecosystem and have researched these issues specifically with Google, leading to me ensuring I'm not as reliant on them as I used to be. I figure now I have about a full days worth of hassle if all my google stuff gets blocked, but otherwise I'm recoverable.