A MASSIVE, MASSIVE problem is that the show was written in 2003. Back then, comic book edge was confined to Watchmen (which was just some 30 year old comic book), and a few comics that had no hope of ever being made into mainstream media like the Bane arc or Killing Joke. The movies being made were X Men, Spider Man, a reboot of Superman, and the most recent Batman flick was either the animated series or & Robin.

Nowadays, the idea of a subversive series is old as shit: The Last Jedi ruined an entire word as did Among Us. Edgy flicks are all the rage. "Superhero... bad?" Is cliche. The MCU made a hundred billion dollars and is now on a rapid decline. Sure you'll see a few more super hero movies, Mildly Successful Man 3, Obscure Man, Spinoff of Hero Team, Reboot Man, Girl Team, Minority Squad, but all of the A, B, C, and D listers are all basically done. So releasing a series of "Man what if super heros bad?" Is soooo fucking passe to do after End game. Hell, Amazon already has The Boys Season 2, so to release Anime The Boys Season 1 is such a cash grab.

The best time for Invincible to be released was 2003. The second best time was 2014.