You're joking...right? The question isn't if something is available, it's what's already being used. Installing Linux would require you to boot from a flashdrive or install it on virtualbox, both of which for most people are unnecessary as shown by the statistics on % of operating systems people use.
What's the Linux % statistics of crypto currency miners? That's the only relevant statistics. Whether your grandma uses Linux or Windows is irrelevant.
That's the whole point, there is no statistics on the % of cryptocurrency miners that use Linux. The only source we have to look at is the % of overall people on this planet that use Linux/Windows, with more than 90% of all computers using the windows operating system...
Linux is less used than even OS X...