> free work

Don't know if I would call it that ?

This was a potential customer reporting a result of an audit of a tool they are evaluating. This is frequent and normal activity in enterprise deals. Most of the time such reports are not critical vulnerabilities it would things like tenant configuration -what business would like versus what CISO will accept or risk acceptance of the product they are buying with monitoring or other prescription on access restrictions or a DPA and so on.

It would be novel business model to spend ton of money in getting a prospect to late-deal stage where they are ready to do a security audio for you just so that part is "free" .

Most companies wouldn't disclose(to the public) even if it was serious , that is not their job, they will report to internal teams and re-review on fix. Strix.ai has a benefit in doing so as they sell a scanning tool for this purpose so we get to hear of this.