I've been running a mid sized e-retail company for over 7 years.  I recently started another company and built it on the Shopify platform.  Their technology is excellent, and their ecosystem of auxiliary tools/software/apps is extremely valuable.  There might be some people signing up with Shopify for the wrong reasons and certainly not every business is going to succeed selling products online or elsewhere.  What I can tell you, is that the service that Shopify provides vastly increases a company's chance of success in retailing online.  I've invested in their stock this year based on my positive experience with their service and I will continue to hold the stock in my portfolio and in my children's RESP.  I believe in this company and their long term prospects.  I think this short seller saw an opportunity to scare the market in a stock that has had huge growth.  Good luck Shopify, keep up the great work!