TV2U to Begin Trading on Tuesday 9th Feb, page-189

Year on year - if we have 2m subscribers in 24 months - well you do the math

As such can attract an enormous forward PE value as the growth is mind blowing.
(But needs to establish first out of speculation arena and into the commercial reality)

Chabanga achieved multitudes of that in two years . 40m ?

At this point it is speculation - but then what's stopping it?

Personally I think the company is being cautiously conservative with the 1m figure. And that is a good approach.