There were a lot more than 10 or 15 people there before the vtol/quad spam. Most left when the leech fest started, including two guys that were happily streaming on twitch. I don't care go ahead and abuse it, hurry up and go leech skills guys. This is why we can't have nice things.
I'm nobody to tell you what to do, I'm just pointing out that this is a clear abuse and not intended at all from MAs side.
How is this leech/exploit?
This is as much of exploit as people walking on the ground with herb box / SI heart fapping and taking hits, because the skill gains on these hogglos are fairly large.
Difference being, with vehicles you get 0% return, hunting you get some along deffensive cost,
With vehicles you burn them and the oil, and in a way, hunters are getting their damage reduced by the aoe and can hunt with no armor.
As far as i knew there were server tests to handle stress, this is a good one to see that EU isnt optimal yet, better, but not yet, there's between 100-120 people on radar with all vehicles. and i havent crashed, in the past i would've crashed non stop on same pc setup
EDIT:
Forgot to mention, exploit would be if there was a non vehicle area and you'd be there with one, which happened in the past and still possible in some areas.