So I was hired in this startup a year ago. Its aim is to make a SaaS. It's been painfully obvious that nothing gets done about this, the only projects we work on are bizarre random demos or small open source projects on github for "marketing".
The company has not had a series A funding yet, and was almost bankrupting some months ago until a VC gave them "some" millions. Meanwhile, there's still no product, and the company pays for worldwide company trips for no purpose (no conferences or anything), pays for life coaches and frequent global flights for the CEO and who knows what else.
When I say "no product" I literally mean it. It only exists on a powerpoint slide without a single line of code implemented.
The worst part is this startup is 5-7 years old, and has gone through the bankrupt -> saved last minute by investor cycle more than one time.
Average employee stay is 6-14 months. During my employment three managers left the company, and four engineers. There's no documentation about anything because people come and go after they see there's no future in this company.
Should I anonymously inform investors that my startup employer is a scam, and if yes, how should I approach it?
Here's my advice to you, and I'm not going to say IANAL because you don't need to be a lawyer to know this: you are working for shady people. If it is, as seems likely, a laundering front, the very last thing you want to do is "go to the investors", unless you really enjoy the feeling and weight of a custom pair of concrete shoes.
I would find another gig ASAP, and then and only then would I sit down and have a serious think about how much I cared about seeing these people get punished for what they're doing. Because the only people you should probably be going to are the SEC, and that would probably turn into a criminal case, and then you'd be getting the very strict attention of whomever set this up. And those people are probably not tech bros.
Up to you, man, but I would seriously suggest you consider this possibility.