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I have no doubt that such people have existed, exist now, and will continue to exist. And they will look for ways to avoid having their identities revealed. The problem for them isn’t that they used insider information to enrich themselves, but that they "leak" confidential information, either directly or indirectly.
At the same time, such platforms can also be used for the systematic leakage of confidential information, bypassing other "spy tricks".
I think it is a dual problem, honestly.
People enriching themselves with privileged information is a problem because it is inherently unfair to the rest of the participants of those markets, it would be almost like stealing money from people.
On the other hand, we also have the positivity of leaking of sensitive information, military information or even company secrets, which could be translated into human and economical losses.
It reminds me to the military guy who betted on Nicolas Maduro getting ousted of power early this year, he was eventually arrested because of inside trading.