"A lack of transparency" - First LastPass, now Slack and CircleCI. The hacks go on (and will likely worsen)
Don't expect victims to be forthcoming. Their alerts conceal more than they reveal.

The downside of closed source.

https://arstechnica.com/information-technology/2023/01/first-lastpass-now-slack-and-circleci-the-hacks-go-on-and-will-likely-worsen/