I've often read that 2FA should be through an authenticator app or a physical key, not via texting a code to a phone number. Malicious sim swapping is a thing, so purposely deleting any phone number from an account should be good practice, right?

So will they also delete inactive accounts that have no phone number, but one or more phone-less 2FA methods associated?

It's phonishness. Your life isn't really unless you have a smartphone.

> This is a very shady dark pattern by Alphabet corporation.

Advertising company (Doubleclick [1]) wants phone numbers to better target ads. No surprise there.

[1] The company currently calling itself Google is not the same Google as yesteryear. In 2008 Google purchased Doubleclick, and what happened is that the advertising rot from Doubleclick ate Google from the inside out. What we have now calling itself Google is actually all the evil that was Doubleclick, only calling itself Google. That's why the Google motto no longer includes "Don't be evil".

if you haven't cared about using an account for a year, why do you want to use it all of a sudden now?