@Dimitri *******
If you are American: here's a screenshot from the Thai consulate in Washington DC showing quite clearly that Americans enter via Visa Exempt entry. Note that the 30 day visa exempt entry has currently been extended temporarily to 45 days for entries through end of March to encourage tourism. I just realised you aren't the OP. The OP wrote he was scrambling in Taipei. If that is where he lives, the Thai consulate there (Thailand Representative Office, to be technical to skirt around the Chinese sovereignty issue) also clearly shows that USA passport holders qualify for visa exempt entry, not visa on arrival, as shown on this page that is linked on their official website by clicking the Visa section, then the submenu option "Countries Entitled for Visa Exemption and Visa On Arrival". Did you check that link?:
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เอกสาร/VOA.pdf