Things are not the same even in other aspects so that's normal. The quality is still there but the engagement is what's low. Many
people sometimes get tired and drop off from performing their usual task.
April was good month for hunters and many good Bounty released. Bounty is useful for project SEO and trending. If the project has investor then I think it's goods for Project to run bounty. Some project have no marketing and community beside the Bitcointalk and we know hunters are not interested in presale which result a project failed.
How did you know that they are good bounties? Even the project doesn't have investors they can pay the user their native token to get investors to increase the activities in using bounty campaign, it is actually a good strategy if you don't have budget to pay the bounty hunters for their efforts to help the project.