I’m quite new to Fiverr, I don’t know a lot of its system and its history yet. But in my opinion, if this continues, I could imagine that more obstacles for new members would be the conclusion, e.g. “x” message a day limit, verification with your mobile number, etc. Fiverr probably must not save its user-data, that’s why it’s even harder to provide consecutive actions against these people.
The problem is, if you are new to Fiverr and didn’t get any gigs, you can do whatever you want to do. Since, if you get banned, you only have to register with another address. It’s a nightmare for departments like Customer Support.