NEOS is a proof of work crypto currency, as in it has to be actively mined
Total coins: 21 Million (after the 21 million cap, a perpetual reward of 0.0625 remains per block to keep the chain moving)
so what that means is once it reaches that cap, every block will turn to be worth 0.625 neos (so about 18 neos in block rewards a day), not including transaction fees people might be paying
keep in mind.. this is quite a few years down the road
at the point that happens the idea will be that neos is worth enough money and the transaction fees are high enough that it promotes active mining to secure the network.