Dropbox bought this and then open sourced it, right? Did they buy the company only for talent, and not the product? Why didn't Dropbox try to actually use it to

Dropbox bought this and then open sourced it, right? Did they buy the company only for talent, and not the product? Why didn't Dropbox try to actually use it to compete with Slack? Teams is terrible, but integrated. Slack is better, but isolated from good video/storage. It does seem there's room for a third option.