Here's how it all works:
1. LSM Apps provides a free app (Easy Contacts) for 10+ years, 2.5k reviews. From that and their own disclosure we can assume their user base is in the millions.
2. This app send all of the user's contacts to LSM Apps; at least full name, phone number.
3. LSM Apps shares this data with Lusha.
4. Lusha sells the data.
https://www.lsmapps.com/privacy-policy
https://apps.apple.com/us/app/easy-contacts/id665856919