Dear Irina
1. Before we made it, we consulted with a lawer
2. As I said before (and lawer as well) : GDPR applicable only for private persons, addresses, phones etc. If any date is public you can do it
3.You cant find in GDPR even one word about companies, institutions etc. All GDPR was made for protection private dates
4.All addresses in our folder are from internet, so they are public date and if you can you find all addresses yourself on internet but you will spend weeks or months for that and we can give you that in few seconds. And this is a different :)