You can't really blame bounty hunters for hating long term campaigns, of course in 2017, everyone is on the boat of the hype, so it doesn't matter if the campaign is long enough. I've seen Legendary members that time raking up thousands of dollars in a campaign that lasted months and months.
But 2018-2019 was different though, many project fails and those who survived just got a measly payment. You are lucky that you have earn on Airwallet. So it's a case to case basis, but I'm sure majority was complaining because they didn't get the money that they were supposedly promised by many project.
Well, we cannot really blame the bounty hunters for being so mad about long term promotions due to the growth in numbers of scammers. Some experienced waiting for so long just to find out that the project was purely a scam amidst being successful. Before, there are only few scammers while now there are a lot already and that could be the reason behind their impatience.
It all goes back to the participants, I think if the project is good then the long duration of the campaign is not a problem for them but if the duration is long and the pay is not appropriate or the allocation is suddenly cut I feel they are very disappointed. So I see very few campaigns now have a duration of up to 5-6 months.
We can still see campaigns having a duration of 5-6 months but there are only few bounty campaigns at the moment. There are only few number of people who are supporting such campaigns at the moment since there are lots of scammers nowadays dessiminated everywhere. No matter how good the project is, it will still be inconsiderate if the duration takes too long and the payment becomes too low.