Hearthstone was making more money on mobile devices (phones, tablets) than on the PC all the way back in 2015. Since 2015, mobile gaming has grown much faster than desktop gaming and now desktop gaming only comprises 25% of the market, with Windows being only 76% of that.
How much of Hearthstone's success do you think can be contributed to being truly cross-platform? I play it on my phone fairly often but prefer tablet to phone and prefer PC to tablet.