Maybe testing? Companies like Browserstack offer that sort of thing as their core business.
Say that you just made a big frontend change to your website. Before you release it, you can open it on the last 10 major versions of desktop and mobile Chrome/Firefox/Safari/etc. Any rendering failures that you find are the sort of bugs that can be very frustrating to debug from occasional user contacts.
But it can be tricky to automate the detection of visual bugs. And what if you have to make a few clicks and execute some javascript to get to the screen that you want to test?
Say that you just made a big frontend change to your website. Before you release it, you can open it on the last 10 major versions of desktop and mobile Chrome/Firefox/Safari/etc. Any rendering failures that you find are the sort of bugs that can be very frustrating to debug from occasional user contacts.
But it can be tricky to automate the detection of visual bugs. And what if you have to make a few clicks and execute some javascript to get to the screen that you want to test?
Anyways, that's one use of browsers-as-a-service.