The only downside of a miner running on phones is the battery life, but as you said that it will only consume around 1-2% per day then this can be a way forward in achieving true decentralization.
A fast blockchain with over 300k TPS requires a large number of blocks and the software on the phone must be constantly active and consume enough resources. It is impossible to achieve such speeds in mining coins, so this coin does not have mining, but possibly nodes on mobile phones. But I don’t know where such speed comes from on weak mobile devices.