Man, I was looking just now... do you know when Action Comics goes sequential on ComiXology? Guess. #844. EIGHT FORTY FOUR. Superman? #681. Legion of Super-Heroes? That's a trick question, friends. It doesn't start at all.
Prior to that, they have about two dozen cherry-picked Action and Superman books. Oh, and Legion Lost (let me try to restrain my enthusiasm). Do they just not want
to make money?
However, I will say that it made me laugh when, because of my script blocking software, the DC store threw up a giant picture of Barry Allen and told me I didn't have FLASH. That's adorable.