Blame the piracy laws. These games are, of course, inherently worthless but the current policies are propping them up when innovation should be in other places.
People only pay for them because they don't have any other choice. If it was legal to sponsor an Android fork that had a pirate version of the Play Store, I'm sure all of the hardware manufacturers would be shipping it with their phones.
Unfortunately "worth" in any functional sense is defined by the demand for it, so in that sense these are immensely valuable. That is my lament, that something with so little functional utility (outside of a dopamine reward loop) has captured so much voluntary worth.
You mistakenly conflate cost to produce with value to consumers. Obviously the content has value to consumers.