From what I see on review thread I'll say the possibility of those users using those platforms they review are far less than the percentage you gave them. Most of the reviews remarks are similar which just goes to show people are copying from what others above them have said to write theirs.
review campaign is supposed to be from people with a good technical background in order to explain the strengths and weaknesses of the service, but in the forum, review campaigns are closer to testing campaigns and giving a general feedback of the service or customer feedback than to being a detailed review, so there is no need for more than one review campaign at the end of the service except with profound changes occurring in the backend.