It's the foreigner being grossly over charged not the Thais getting in cheaper because a minority of them pay tax. If it was a tax break then what about the foreigners paying tax? as they would be 'supporting' these crappy national parks just as much as Thais.
Some things I picked up along the way for my own research.
1. No clue
2. No, shouldn't a problem if you're going straight to the airport when entering Phuket again overland. They changed it recently. I think you only need to be fully vaccinated.
3. The only insurance I was able to find that would cover an ALQ was the one you get for free with Emirates when you fly with them. It also covers the CEO requirements and some extra stuff.
I don't think you need to stay in an SHA+ hotel after 14 since you are allowed to overnight with friends and family after this period. I don't see why you couldn't also stay at a non SHA+ hotel.
So there one can say that in fact there is "prohibition" in Thailand because of COVID!?
Then who is to say that any 'rights' can't be controlled by issuing an "emergency decree"!
But if "drinking" people are such a danger to society why not outlaw alcohol completely like drugs are outlawed?