I'm fully on your side with them being near monopolies and them being overly expensive. But there's no arguing that they have expenses and they need to make money.
How did you think F droid managed to run for free if it cost that much to host apps?
Somehow you said you were fully on his side about monopolies but claimed Google the was the one being exploited. This doesn't make much sense.
And, as said in a sister comment, I'm fully on your side of 30% being to much. But that does not mean that I think they should get nothing.
This is supposed to be analogous to publishing an app and asking for donations?
>Being a criminal does not exclude you from being a victim.
This is not a criminal dispute nor analagous to a criminal dispute in any way, shape or form.
If two parties "economically exploit each other equivalently", there is no exploitation.
[0] Whereas the "fair share" is not necessarily 30%, but >0%.
Hell, look at PC gaming where there are no restrictions. You have Steam (same 30% cut) and... Epic?
Given the scams out there users are already reluctant to enter their CC details, so a natural trust network effect would weed out everyone else except the biggest players.