Well I do not think there will be a big project if coin is based on mobile mining. I do not recall its name but long time ago I had a program that said we could mine Bitcoin on our mobile phones.
I did have this program on my phone all day and night. And when I did wake up my phone was hot and I did not make any profit from it. I do not think it is a scam but I do not think we can make alot of profit from mobile mining.
There are lots of coins that were minted through mobile phones that did well when the got launched. Just that most of them crashed afterwards. Some were pump and dump projects and others lacked enough liquidity to sustain the project. Some even went as far as scamming their participants, the didn't pay as the promised wasting the subscription and time of their participants.
But a project with a good community. One where people can vent, express their frustration and interest might have big tendency to do well. Pi is one of such coin. Although we still have to trade with caution.