I was mostly being facetious, I try not to use Amazon. My wife does off and on and has used a free trial 3-4 times a year.
The trials are 30 days (in the US) and years ago, 4-5, I would just use a throwaway email and do a new trial every 30 days to keep Prime. Not sure if they guard against that at all now or not.
Good to know, glad you take advantage! Amazon is one of several companies I avoid on ethical grounds but I fault nobody else for shopping there.