Yes, there are so many scam bounty and f you are not careful, you may fall into the wrong project that it is very good for you to take your time to do a very good research of the project, read the whitepaper and be sure of the potentials before you join the campaign. I am also sure in future the rate of scam will reduce in the crypto community when there are regulations or bodies put together to help ensure of the project potential before they come into the community.