Parasitic? Writing software for folks' devices and selling it isn't parasitic...it's just participating in the market. Weird that the overton window has moved so far that anything not built by the trillion-dollar duopoly is considered some kind of free-rider.
That trillion dollar duopoly is probably the worst case of free riders. It’s an enabler/vehicle for all the other billion dollar free riders to steal from the population.
It's not weird - you've just completely misunderstood the situation. This is about the OS, which the software in question (the alternate app store) relies on, but generates no revenue for. The devices are still being sold, because their manufacturers are allowed to make money, the alternate store is allowed to make money. Only the OS maker will make no money, because that would be bad.