As an additional data point on the new limitations on visa exempt entries, here’s my Thailand entry / exit history for 2025 (USA passport). I entered again yesterday afternoon on a visa exempt basis and had no issues or questions.
Sept. 29 enter Thailand at BKK visa exempt. Leave Thailand on Oct. 17 and fly to Vietnam. (19 days)
Nov. 17 enter Thailand at BKK visa exempt. Leave December 13 and fly to Bangladesh. (27 days)
Dec. 24 enter Thailand at BKK visa exempt.
Obviously, this is a pattern for a genuine tourist rather than someone trying to live here on a visa exempt basis. No problem at all on the third entry.