As far as I was aware, Thailand was one of the countries that banned payments with cryptocurrencies, while at the same time trading and owning them was allowed. Will domestic people be allowed to pay with cryptocurrencies now or will it only be allowed for foreigners?

Be that as it may, I don't think that their tourism will profit too much from that, because once there was also a crypto island Boracay (Philippines), but tourists simply did not show interest in paying with Bitcoin and in the end that small company that provided payment intermediary services closed down.

The percentage of people who are willing to pay for goods and services with cryptocurrencies is, in my opinion, less than 10%.