@Tod ********
Tourist visa yes - I've had one where I was asked back in 2017. Now I think about it 18 months is short, could even be over two years now - was it mid 2016 or 2017 they started to ask for it? I don't remember. Visa exempt no idea - I haven't had one in years.
Again - general rule is that if you transact with Chiang Mai Immigration they want a TM30 on file. The dozens upon dozens of reports of people being fined didn't come from no where.