If Rebellion wanted a comic steaming service to go up against DC Universe, Marvel Unlimited, or even ComiXology Unlimited they would be better off releasing their content by title, not by Prog. Rebellion isn't going to painstakingly go back and scan Progs raw, ads and all (legal questionable at best). Though having letter pages and Nerve Centers in some form would be nice...
But there's a bigger problem, what Marvel Unimited and DC Universe have that 2000 AD doesn't is a shitzillion number of comic books. When you really think about it, 2000 AD might be a weekly anthology but it effectively only publishes five 20 page comics a month. Doing some quick and dirty math, that's only 2400 equivalent comics to Marvel and DC in the same time period. Even adding Megazine and British Treasure of Comics material you're only probably looking at 5000 total comics by page count on the extreme outside. Marvel and DC's services have tens of thousands of comics available with hundreds (thousands?) more added every year.
As a service, there is a real risk of readers signing up, reading basically everything, then unsubscribing. That's not really a practical model for comic streaming I'm afraid (or at least I wouldn't think so)