Is this really going to increase conversion rate of a website? And what percentage of users is even seeing a cursor anymore, since most people are accessing the

Is this really going to increase conversion rate of a website? And what percentage of users is even seeing a cursor anymore, since most people are accessing the web on mobile devices now? Also, what exactly does this even do? Can I not just add cursor: url(myimageurl) to my css and have my cursor for free?