What did you learn in altcoins, those projects didn't paid bounty hunters even after successful. We can gather information by all unpaid bounties and with reasons why didn't paid. For us this is very hard when our good research is successful but admin cheated to bounty hunters. List why didn't paid, your experience and history about unpaid projects
I learnt that irrespective of the various excuses mentioned differently by different projects as to why they would not pay for bounty works done, it is more about personality.
Most projects right from the start of bounty campaigns, already concluded not to pay hunters.
Thats why excuses are not far fetched from them. The best case scenario is to just dyor and avoid such cases.