The license for data.go.th is this one
https://data.go.th/pages/dga-open-government-license

The license has been discussed before. It seems not really compatible with OSM.
https://community.openstreetmap.org/t/documentation-of-gistda-import/90597
https://community.openstreetmap.org/t/looking-for-more-sources-on-official-boundaries/108846
