Touch typing. Like I said I cannot find any reputable statistics. touchtypeit.co.uk claims “according to research” it’s less than 20%, but does not actually link any specific research. There are some other sites like it that are trying to sell you a product and list a low percentage, but I can’t find any actual studies or statistics
That would seem to be a failure of your client’s or instance’s Markdown parsing. The link works correctly from Mbin.