I explain it, as majority of players run those on sandbox VMs or old PCs with Win, as security savvy person would not run/install any type of internet games even coming from trusted sources, on business/personal PC that have exposure to personal/financial data of individual (some do not even use PC for that as smartphones supersede that role). Therefore the main platform for those games are 3-10 year old PCs with Windows. Macs have been on expensive side so they have not built up critical mass there, hence negligence with those. Perhaps in next 10 years it will change, as Macs get popularity so households will have more crude of aged Macs along time.