Google Sheets beat Microsoft to the punch and introduced a Checkbox as one of the Data Validation options. You can go to Insert > Checkbox to quickly create one, and you can customize it by going to Data > Data Validation. I've updated most of the Google Sheets versions of my checklists to use that feature. I hope Excel gets smart and introduces a similar feature some day.
Recall that at the start of this article I mentioned how easy it was to start an online business? The other side of that coin is that every man and his dog is doing exactly that. Online consumers are jaded, and impatient. It is not easy to convince them to spend their dollars with your relatively unknown startup because there are millions of relatively unknown startups, and most of them are complete rubbish.