I think everybody having an account with BitMedia received that mail. Maybe they should have taken things more carefully by sending it only to publishers actively running ads (not advertisers, inactive publishers etc.)

However, I find reminding publishers about quality requirements is somewhat a good step because the Bitcoin advertising market has become increasingly aggressive by both publishers (fraudulent traffic & clicks) and advertisers (running trash campaigns including scams, ponzis and scammy ICOs).
What makes BitMedia indeed ahead of all other Bitcoin Ad Networks, is that they have quality advertisers and so require quality publishers.