It is still on the rise albeit the recent crash in price of cryptocurrencies. It usually appears on sites that give you direct access on download links and automatically installs the malware on your machine in the background. I've become a victim of such on my gaming machine back in 2017, when I downloaded a dll file that is needed to run a certain game. I usually get 200+ fps on the same game on ultra preset, but suddenly the performance shifted to shit (30-40 fps on normal scenes) which prompted me to do a full scan of the said machine. To my surprise, a mining malware is active on my pc which causes the poor performance of the rig on the said game. Luckily the malware was easy to remove yet I still did a full reformat just to be safe.

Heck, even websites have embedded mining malware scripts that run on the background that the end-user doesn't know about.