The organization began allowing gay youth in 2013 and ended a blanket ban on gay adult leaders in 2015. In 2017, it made the historic announcement that girls would be accepted as Cub Scouts as of 2018 and into the flagship Boy Scout program — renamed Scouts BSA — in 2019.
To be honest I never expected the BSA would attempt to reform itself as much as it has. I was in a very homophobic troop, a scoutmaster of mine vented to my grandma that all the queer people ought to be put up against the wall and shot. I'm glad things are improving but I don't think I'll ever see the organization in a positive light.
Their numbers are declining, which means revenue is declining. So the more inclusive they become, the more money they can make. It’s been an ongoing issue even before COVID hit (which hurt a lot of troops and packs).
I can’t speak to the Mormon exodus. That was before my time. But yes, they’ve gone through a lot of reforms from what I’ve heard from the long-timers; and from all of the training (e.g., YPT, two-deep leadership, etc) I had to do.