With the lack of space in my apartment and the danger of the weight I need to stop getting paper comics. I don't want to give up reading them (I have a zine to keep up, after all) so I'm looking into digital ones.

I'm hoping you fellow readers can give me answers here:
1. DC and Marvel have this service, but is it for every title?
2. Do the other companies have them?
3. Could I read them on my PC, or would I need a different reader?