You already have "subscription" keys from Honda, Toyota and others. They are designed to have you subscribe to replacing your remote as exorbitant prices, when they break.
GM keys here were ultrasonically welded so you cannot replace the battery. The Mitsubishi keys break at the key ring; they were so badly designed, once can only assume it was done on purpose. Honda and Toyota keys cost around $350 to replace, and are also of poor quality. The BOM cost is around $2; certainly no more than $3. Toyota and Honda make their keys so you cannot swap out the key shank. If I ever buy a new car again, I will demand two free keys, else the deal is off.
So if you have to pay $5 per month for a subscription for your FOB, it is roughly the same price at having to replace your crappy remote key. A FOB without a key might be more mechanically reliable than a remote key, hence the manufacturers get creative finding other ways to get money out of you.