Guys, you forgive me, but I can not understand how mining in the browser? It turns out that any user can just start mining on his old laptop? Sounds fantastic!
Mining is not resource intense but the cost of production manifests itself in gas fees. If you have two competing transactions, miners will tend to prioritize the transaction with the higher gas price. If one user calls mint() with as gas price of 2 Gwei and another user who pays 4 Gwei, user number will likely lose the bid.
Theoretically, gas price could go up indefinitely depending on how much demand there is for mining SOV.