not just the 3 projects that you mentioned but there are many more projects that ignore bounties and get nothing. selling in the beginning is the right choice than holding because most projects are full of crap
The price of such projects looks very attractive. But after the bounty ends, we need to wait at least 2-3 months to be able to receive tokens from them. And by then the price had dropped many times from the beginning and we only received shit tokens
we must be carefull to choose the right bounties,before we decide to join in the bounty program. good project will be stable in the market for a years,not only 2-3 month.
Or you can choose bounty program which gives payment through ethereum / bitcoin.