on my computer with an I5 (4 threads and 3Ghz) i get if i use the max ~55H/s
you can sell monero here (just an sample)
https://anycoindirect.eu/en/sell/monero
and Monero is like Bitcoin but for more privacy (a mymonero.com wallet just need a long text of random words as login)
more about it here: https://coinhive.com
more at coinhive.com
Why?
Because you are using a device to mine for you, unbeknownst to the potential app user. I could get into this more, but would be nice to know Google's stance on this issue.
Even with ad's now you must inform the user prior to download.
I'm not technically against this idea, just wonder the position Google will take.
Maybe its enough if your say in the description that there is a miner that use the hardware to generate Monero (XMR) coins
if i use it in my apps i let the user decide to use it (to support me) and if you just use 1 thread and 50% of the thread's power then the user dont "see" it (like warm cpu, battery goes down etc)