Various offers like these can be seen on email,
There is an option called Gmail Promotion where different organizations send similar fund recovery offers.
I don't know how they get everyone's email address.
It probably comes from some sources who have some list of email addresses from other people like if you are here before around bull run 2017-2018, tons of airdrops with some shitcoins, to participate there you just need to fill up some forms or sign up in just websites and your in.
Thru that for sure they already have your email addresses, most of those email for sure are related to cryptocurrency since it is coming from here, that's very alarming before, different airdrops popping and for sure some of them are just farming email addresses and sell or use it to some illegal things.
Or it's probably a random email address and they will send their e-mail to those random addresses they generated.