I checked many old bounty threads(usually a bounty from 2006 to 2017). Although there were some scams, not much.
Look at the current bounty threads, almost half of them are scams or about equal to scams.
Think about it, why is this? How to stop scam bounties?
For most of your advice, I very much agree,but I have some different views.
1. There should be a requirement that if anyone want to post an ANN in Bitcointalk, he must deposit 0.1% of the total amount (of the softcap) in an escrow account. For example, if a project is planning to raise $50,000,000 from the investors, then before creating the ANN thread the promoters must deposit $50,000 in either BTC or ETH to an escrow account held by the Bitcointalk staff. If the soft-cap is smaller, like $500,000 then the escrow amount should be 0.1% of that, i.e $500. If the promoters vanish, then this amount should be forfeited. Also, if the promoters go back on their promises once the tokens are listed, then this escrow amount should be frozen and may be (partially) released only if they achieve the objectives which they had promised earlier.
Hosting means responsibility and obligation, and it is difficult for custodians to guarantee that they are reliable.
And I don't think BTT will allow their staffs to engage in such business activities, this is one thing that goes against the rules of the forum.
2. There should be a list of approved bounty managers and those outside this list should not be allowed to act in this role. There are a lot of trusted bounty managers here, like Yahoo62278 and Lutpin. I don't think that newbs should be given priority over them.
The trustworthy bounty manager is of course good. The question is who will evaluate which bounty manager is trustworthy? What criteria are used to evaluate?
3. In order to participate in a bounty campaign, it should be mandatory for all the users to post their ETH address in the "Location" field in the profile. I have noticed a large number of spammers using someone else's BTT account and their own ETH address to enroll in to social media bounties. This step will put and end to the practise and will weed out the spammers.
4. All the bounty campaign participants must be carefully screened before the payout. In order to prevent token dumping, a few steps can be taken. Since the bounty reward is 1% to 3% of the total amount, the promoters themselves can purchase this portion from the exchanges. Or they can make the bounty payments in BTC/ETH. There should also be a condition that the promoters should hold on to 90% of their tokens for at least 12 months. (Because I have noticed that it is the promoters who do dumping in the vast majority of the cases, and they blame it on the bounty hunters).
The weight of tokens held by bounty hunters is actually very low. Their dumping can't really affect the price at all. The more reason is that ICO promoters dump their tokens.
5. KYC must be mandatory for ICO promoters and bounty campaign managers (unless they are on level 2 DT). If this is done, then the scammers won't be able to set up multiple fake ICOs.
Who will check their KYC? Scamer check yourself?
Your suggestions are very good, but in practice I think it is very difficult. In my opinion, the government's supervision of ICO and implementation of the ICO licensing system may be the best way.