Don't worry it's legit.Use Gridcoin and you can mine on any number of mixed devices, I have a powerful PC on Win10, an old laptop on Win10, x2 galaxy S6 Android, an Xperia z4 tablet Android, a Pi3 on Linux, a Pi2 on Raspian and even on my mums PC when she runs it. The only devices you can't use are iPhone or iPad, cos of Apple licencing.