...after all if you (and possibly your co-founders, also lying on the beach) are going to receive all or at least a very large chunk of the profits then why do all the hard work?
This same resentment may (will) occur with early employees if the cofounders are part time. Have same issue at current company.
And the same resentment can happen if the founders are full time. This has happened to me 2x:
The first the sole founder was seen as fiddling while Rome burned, long lunches on with rich friends and always on the phone, never doing anything (and getting paid well for it). Now I recognize he was probably trying to line up another round - but this was dot.com 1.0, we were young and didn’t know how the game was played. Also he just wasn’t good at communicating this downward - or at least as far down as we were.
At the second place the founders were all regarded as incompetent, and thus getting paid well for doing useless work. I think they where just nerds, and bad at interacting people.
I think management is hard and resenting your boss is common.
This same resentment may (will) occur with early employees if the cofounders are part time. Have same issue at current company.