The chance of you getting suspended is relatively high if you promote 30+ projects (that maybe require at least 1 post/repost per day). On top of that, consider the risk you're taking if you only use 1 account. Let's assume you get temporarily suspended or even banned with all bounties halfway through. What then? The links to prove your activity aren't valid any longer, you can't use your account (for a time) so you technically need to register with a new account which could be viewed as an attempt to cheat (multiple accounts).
But be honest, what project profits from any spamming bounty hunter account. So you maybe should reconsider if that's the right way of doing it. If everybody only spams, the project will suffer. Look up Free-rider problem: https://en.wikipedia.org/wiki/Free-rider_problem it's meant for economics and public goods but you can easily adapt it to this situation