I have a very early gmail address. A very common first name plus two letters. It is almost unusable by now. Invoices, subscriptions, important documents about some persons real estate dealings. They all end up in my inbox.
I have around 20 or 30 google accounts attached where i am the backup email address. Those people forget their passwords or stop using their accounts and i get email notifications about that. No confirmation from my side necessary.
I set up a new address that is less likely to end up with this problem. But migrating away from the old one is not easy…
Exactly the same situation with me in terms of gmail address (although my names are less common).
I get so many other $MY_NAME emails, including bills (including multiple credit cards and things like Afterpay), deliveries, medical details/reports, family communications, etc, etc.
And it's very clear that quite a few online services blatantly don't verify email addresses, they just assume the email is valid and allow the person to start using it.