Now in a serious note, I think new users should not be allowed to post scam accusations in this forum until they become a high ranked member or have some other type of protection so newbies won't be able to do what they did in the past few weeks.
You clearly have some tunnel vision with scams and gambling. Your proposed solution forgets the fact that most users scammed are going to be newbies, and likely in a trade. Whether it be forum or crypto newbie in general, limiting any ones ability to create a scam accusation would defeat the purpose of the board.
In the end users just have to understand the limits of this board and it's purpose; which is mostly to warn and prevent. For whatever reason many assume they will be made whole through their accusation and that's not the most likely outcome. Same goes for investigating if there was wrongdoing and on who's part, it just clears things up to prevent others from losing funds.