liquidity providers each have a specific % of the pool, based on their shares, based on how much they've added to that pool... I don't understand where this question comes from because it seems obvious? well, I guess that's only if you're active there, maybe from outside perspective it seems more complicated than it actually is.

Basically if you have 100% of the pool liquidity and people are adding value to it from the fee, then you still have 100% of the pool afterwards, it's just larger now, does that make sense?