I think the spammers (actually scammers) just got smarter since bitcoin scam and crypto locker are profitable. I think they create a “burner” gmail account and

I think the spammers (actually scammers) just got smarter since bitcoin scam and crypto locker are profitable. I think they create a “burner” gmail account and first train google spam filters to think that gmail account is valid (short email conversations, not links, etc. for about year). Then they burn the account in few days. And then next one… I heard that one gang makes/burns 1000+ gmail addressed per day.