According to current press releases, the Chime SDK isn't going away just the Chime service sold directly to customers.

> Note: This does not impact the availability of the Amazon Chime SDK service.

https://aws.amazon.com/blogs/messaging-and-targeting/update-...

I could not find a reliable source for this. Got a link?

Right on slack's webpage.

https://slack.com/blog/news/slack-aws-drive-development-agil...

Unofficially, this agreement happened at the same time Amazon started using slack internally