Well I had the conversation finally.

It unfortunately went pretty much as I expected.

The investors were completely understanding, thanked me for my hard work and wished me well as they know its time for me to move on. For them, this showed another point where the founder was unable to manage himself and the work properly.

Hopefully we can all give the founder feedback (if he will take it without being offended) on how to make the best use of his and our time working hard as a team.