Them being proprietary means they can invest in marketing and UX and QA. That's how you get a company of 500 employees to buy your product that "just works" in

Them being proprietary means they can invest in marketing and UX and QA. That's how you get a company of 500 employees to buy your product that "just works" in all browsers, operating systems and mobile devices over a free one that needs every single user to fiddle with a custom solution. Spending $5 per user and month is way way way cheaper than wasting 1h of an employee's time even once.