This reminds me of the old land line "touch tone fee" you'd pay for touch tone service, even long after nearly everybody had migrated away from the original pulse dialing. Not only did the phone company charge for it long after they really needed to, but you had no assurance the fee was really going to pay for that particular part of the service you were getting.
This is one of the big problems with these add-on fees: they claim to be for one service, but there's nothing preventing the company from using the money for something else entirely.
I remember reading that early on in the telephone age, some people had leased their phones from the telephone company for $5 a month or so rather than buying one outright.
They then proceeded to pay that lease fee for decades, ultimately paying hundreds or thousands of dollars more than the cost of the phone, and continuing to pay that fee even when replacement phones could be had for $10 or less.
This is one of the big problems with these add-on fees: they claim to be for one service, but there's nothing preventing the company from using the money for something else entirely.