Why not?

TBC, I don’t use the MSN homepage or the Yahoo! homepage. I go directly to the email account.

I mean, should I change just to change and not be associated with what “old people” use?

Sure, I could use Proton (guess what, I do! You can have more than one mail account!) but all the contacts I know and all my accounts are tied to the old mail address. Some of the people are older and getting them to change my contact info is more pain than it’s worth. I’m not going through all the accounts and dealing with the change of email, 2FA emails, and likely password change demands. Despite my account being under the prying eyes of Big Data, they’re stable. Odds are my account will still be operating in a decade, and using a newcomer comes with the possibility that they’ll disappear or just be bought up by Big Data.