The problem is that right now a spammer who creates hundreds of low effort apps gets the same service as someone who spent months or years on an app, only to get it banned over a minor issue.
I know that reviewing apps and quality control costs a lot of money for Google and Apple, and I'm ready to pay for it, as long as I get some peace of mind that they don't kick me for accidentally violating some policy with a feature that thousands of other apps have as well.
In reality, even uneducated stupid customer service would be better than the current state of affairs. And it's not just play store developers - these youtube takedowns, etc, costly people real money.
These large platforms are markets in their own right, and should be seen as such. They are simply too big to be covered by existing laws.
A fixed filing fee would level that imbalance.
If App Stores charged a fee per submission, that would drastically cut down on spam submissions, and free up resources for those of us who actually put a lot of effort into our apps.
But this cuts into the gatekeepers' profit. Why have a cost-neutral program when you can not worry about having that program at all, and (in Apple's case) still charge people for access to the store and documentation?