I think it's simple. If you don't want it, don't go to Thailand. If you don't like customer service at a restaurant, you don't go there. If you don't like a product, you don't buy it. If you don't like the rules of a country, you don't go there.
Seems like it's only for US citizens living in Thailand on a US income or maybe some few other exceptions, so it's not a good read for the bigger part of us.
Live in means she lives rent free, doesn't necessarily pay water and electricity, has no costs for her commute to work. A basic job earns you around 300-500 baht/day but you'd still have all these costs. If you want someone who speaks English that can double your income (doesn't have to but can). If you want to be reasonable, my personal suggestion would be anything between 400-800 baht/day.
Most Thai people cook for themselves and do their laundry themselves. This being said, there are significantly more places to eat out and places to get your laundry done than we are used to in the west. Also, especially on the country side, the kitchen is usually placed outside the house under a side roof and, as well as the laundromat. That's why you might find the layout of the house doesn't include these areas in per default.
you're absolutely right. The reason for my recommendation was not because of the TEFL but because many agencies that offer TEFL courses can transfer you to schools all around Thailand and also take care of the visa. At the same time, doing a TEFL in Thailand has its perks because they know how teaching at thai schools work and can prepare you for that.