Seems like a nice project, but this is simply not true (at least the last part):
"Be WARNED that leaking any vulnerability of the platform on any social media platforms or channels will lead to cancellation of Bounty and might also invite legal action."
People discover vulnerabilities all the time and disclose them publicly and they don't need anyone's permission to do so, code is free speech in most western countries.
There are literally websites that have been around for years that are dedicated to archiving exploits for publicly disclosed vulnerabilities in products from companies from Microsoft to Adobe:
https://www.exploit-db.comSo just be aware and maybe make your wording a little closer to reality and understand there is an industry full of precedence. You'll need to work with indepedent bug hunters, but they don't owe you anything (unless they're literally on your payroll).