If you posted on blogger.com (or any platform with enough money to hire lawyers) you probably gave them a license that is irrevocable, non-exclusive and able to be sublicensed.

There are reasons for that (they need a license to show it on the platform) but usually these agreements are overly broad because everyone except the user is covering their ass too much.

Those licenses will now be used to sell that content/data for purposes that nobody thought about when you started your account.