I have created this issue, but am still finding out the details of what actually happens.
I have noticed the last year that occasionally I have to remove blenderkit files from my home folder. To my knowledge I haven't enabled (I veryfied) blender kit add on at all. Inside the folder a json file is stored. Sometimes it happens often, the other times it does not.
I find it also strange that it want to store files in the user folder. In linux storing it in the cache folder would make more sense just like cycles does it.