I dont remember the projects that paid so much. If in 2018 you could still find profitable bounties, now it is very rare.
In 2018, ICOs are still alive and lots of projects have completed their hardcap. That's why you see there are lots of bounty with big budgets, but they are still successful and distributed to bounty hunters. Now that the ICO is dead and there aren't any projects that can raise funds, so it's hard to see the successful and big bounty right now.