I'm not suggesting anything in particular and maybe shouldn't have used the word lobbyist and certainly don't want to sound like a conspiracy nut - but it's a good thing to keep in mind that if/when existing banks and existing exchanges become involved in trading cryptos, they'll want less competition from the vulnerable incumbents.
I completely agree though. I can't even begin to imagine what the crypto exchanges are getting away with. I haven't read about about any dark pool scandals in years so I think the banks have been behaving better.