I don't invest in fake ico but I follow a lot of bounty on fake new altcoins as a result we waste a lot of time on fake bounties.
between 2017 and 2018, many bounties were fake.
Its also kind of scam, you give free marketing for scammer to market their project better.
People who do bounty must take a look deeper about the project that they will participate unless they will got nothing from it.