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.
Well, as crazy as it is based on how they keep looking for loopholes and trying to have a filled day, it is a normal thing to be seeing at this stage. Sure, there is a need for most security organizations to be thinking of a way to at least curb this issue, but being that this is a new thing for them, it certainly will have to be something gradual.
Awareness as it is now, is something that is very important as so many people right now are not even aware of things like this, since they are not tech savvies. At least, you were able to detect something was wrong with the speed of your machine and had to do the needful, how many people would even realize that?