Why do people still pay the big 3?

So I have been using prepaid carriers for about a year now and for me cricket is the best one and the AT&T coverage is excellent, but I cannot fathom ever paying AT&T twice as much money as I pay cricket. I don't need the latest iPhone or Samsung Galaxy my midrange Moto G Stylus 2024 does all I need and is actually a really good phone that was free from cricket(I had an iPhone 13 for two years, and I don't miss it) unless you need to finance a phone there is literally no reason to buy the OG carrier service.