Easy to mine because the difficulty is low.
For instance like it would be for a private Blockchain with many less gpu miners processing smart contracts at a slow pace since fast transactions are not necessary.
This way you only get coins directly from app purchases or from mining rewards with the rewards linked to miners account so they cant be sold to exchanges.
The miners would process your transactions because they want to use the service for free and then app purchases would fund everything else
Why do all the coins have to be linked together and controlled by bots?
The issue is that if you are talking about purchases, the person accepting payment has to be able to do something with the currency. If I build an app and sell it using this magic coin you talk about, how do I get compensated? Its worthless if I can't trade it for some useful. Really no different than real life tokens at arcades, car washes, etc.
What you are describing is nothing more than a coin with a proof of stake reward.