"We’ll be discontinuing development on Crucible. We very much appreciate the way that our fans have rallied around our efforts, and we’ve loved seeing your responses to the changes we’ve made over the last few months, but ultimately we didn’t see a healthy, sustainable future ahead of Crucible. We’ll be transitioning our team to focus on New World and other upcoming projects from Amazon Games."
This decision seems to stem from the fact that people just don't like the game very much. Reportedly, after another round of closed betas where people got to try out some new fixes, the results came in and Amazon figured they just weren't cut out for this business.
Anyway, they continued.
"In the next few weeks we’ll be hosting a final playtest and community celebration, both in-game and in our official Discord. After that point we’ll be disabling matchmaking, although you’ll still be able to play Crucible through the custom games feature. Stay tuned for more information on that event. Servers will stay up for custom games until noon PST on Monday, November 9, 2020. "
Crucible wasn't around long enough for anyone to miss it, so I don't think many people are going to mourn its passing. But I'm sure there were a lot of developers who put their heart and soul into it who will be bummed, and I'm sure this sucks for them.
At least they're not out of a job. Reportedly, they're being moved to other projects Amazon is working on, including a much more promising MMORPG.