[curiousObject]

“ emails for a few services”

You mean these emails are more than just a first verification step to check that your email address exists and to confirm that you want to sign up as a new user?

[amihacked]

The emails say things like "upgrade your trial account now" or "you might be interested in these other products". I have not seen any welcome or request to verify emails.

[curiousObject]

Unless you’ve got evidence to the contrary: this sounds most likely to be spam campaigns that’s being sent to millions of email addresses, from leaked lists or random generated.

One of the emails is yours