Except when I buy something at Amazon on my Chase card then Maryland has no record of that to use against me. ‘
I have read that CA brow beat Amazon into charging the tax for CA residents by threatening their other businesss interests,
I think you misunderstand how origin based sales tax works. Your state wouldn’t be regulating the citizens to pay the Use tax anymore. They would simply regulate businesses located in your state to collect sales taxes on all sales whether the buyer was physically present or on line.
If you bought from AZ you would be charged WA sales tax instead of no sales tax unless you were actually purchasing from an affiliate seller located in some other state and then you’d be paying that state sales tax.
You would probably start looking for sellers that live in one of the five states with no sales tax or one that was much lower... that is why states don’t want to go their.
It would cause huge demand to lower the sales tax to a lower rate in order for their retailers to be competitive with other states and then there goes the cash cow.
The MFA lets them keep their high rates and prevent you from avoiding the sales/use tax.