comiXology powers not just its own Android and iOS Comics app, it also is behind Marvel's app, as well as rival DC Comics'. The blog post from the company said:
We expected a high degree of excitement for the Marvel initiative -- and had believed ourselves prepared -- but unfortunately we became overwhelmed by the immense response. We’re still struggling to keep our systems up.As a result of the gigantic FUBAR, Marvel and the company put the promotion on hold.
The result is that you aren’t getting your comics when and where you want.
The titles went from 1960s Silver Age versions to contemporary issues. That meant, for example, if you wanted to, you could read the original versions, rebooted versions (and there have been many) and the the current Marvel Now titles.
Instead, those interested in the promotion are asked to sign up for a mailing list. The company will update users on the list when the promotion is again available.
It's unclear, though, how long from now the promotion will be restarted. However, with the promotion shut down, purchases via the website or the apps are now working again.