A couple of times, i have got private translation bounty requests that not listed on bitcointalk. i think there are several bounties like this, not official listed on bounty thread but profitable for hunters.
For example, telegram managers for a good project, they earn stably by managing telegram. however, we cant find those bounties in ordinary participation only. Exactly private bounties.
I think that there are not a few examples like this.
and I want to hear about private bounty experiences you joined.
To be honest,I believe that even now we can earn efficiently through this industry.
Understand that there are many places you can find the bounty campaigns are being listed and this bitcointalk also one of the sources to run the legit bounty campaigns. Whenever the users find the suspicious activity about the project.
They will complain and tag such campaigns owners and managers account.
If you believe the bounties are legit outside the bitcointalk, please examine with all the aspects and then join to it.
Personally, I did not join such bounties, I suggest you not join such campaigns since there is no support for participants safety.