There are hundreds of companies, many of them quite large, that do this. ZoomInfo, DiscoverOrg, Hoovers, Data.com, Clearbit, UpLead, etc.
Like it or not, sending unsolicited email is how millions of sales professionals make a living. Before email it was unsolicited mail, voice mail, or phone calls. Outbound sales is an essential part of the world we live in.
Honestly, I'm surprised that this is news to you.