Well, it’s finally here: after fan petitions, crowdfunding campaigns for ad space, and support over social media by cast and crew, “Zach Snyder’s Justice League” hits HBO Max in March. With COVID still putting pressure on the movie industry, it’s surprising that WarnerMedia has been able to follow through on its promise to fans about this release. Post-production went smoothly last year, though, so movie fans get what they want (a rarity these days).