If you remember on Google Plus, three groups of people were initially invited - media, celebrities, and IT.

If you also remember, everytime a new site opened, everybody was all over us to join the sites while it was still early. Medium and Quora were amongst those.

I think that just a lot of tech writers could in. That'swhy they write about tech.

Very few people on hubpages were keen to join Medium, simply because of the topic. I seldom read tech. It's not something that interests me. Most people in the world do not read tech articles. If they did, then the newspapers would be full of them, as would be the magazines, etc.