In my opinion, it is normal if a project does not give a prize to its participants, because the managers do not reach the softcap even though they have to return the money to investors, there may be a lot of obstacles that get it so that it fails to run
That'a the risk in participating in bounty, therefore you need to study what you are promoting that they will have a great chance of success so you will be paid according to what is written in the allocation.
Some project even are successful sometimes does not pay their bounty participants, they are scammers actually, that's another risk, and other thing is some campaign does not pay the bounty outright to avoid the dump, that one is understandable, it's better to wait until the market is in good condition and selling only a portion would help for the coin not to dump.
The team are existing an effort just to list a coin in an exchange, therefore they will find a way to prevent the coin from dumping.