This is a rather strange event. I read that Polymarket does not have a license in Thailand... But, in my opinion, you should not equate this prediction platform with a regular casino. After all, it is a largely decentralized platform. Trying to ban it on the basis that it does not have a license is the same as trying to ban Bitcoin because Bitcoin does not have a license in a particular country, lol. The gaming industry does not stand still and gradually more and more elements of decentralization are beginning to penetrate it. Sooner or later, national governments will abandon the idea of licensing everything.
They are trying to ban it because they cannot regulate it and get income from it for the state treasury. You are right that it looks pretty funny, those who want to continue making forecasts there will bypass this "ban" without much effort since it is simply impossible to track everyone there, the industry is developing very quickly, but governments are not keeping up with technological progress, it will not be possible to simply ban it.