...Though Most of the project are scam nowadays, if the bounty manager escrow the fund scammer does not get the more chance(but it will not stop). And to honest I have talked with some project team as a manager, when I ask about the escrow they don't agree with that.

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Depositing does not solve the problem of bounty payments if project tokens are deposited. Because if the team decides to close the project, such tokens will still not cost anything. It would be nice to Deposit a cryptocurrency such as bitcoin or ether, but I don't remember such cases recently.