The line between helping others and full on people pleasing is too blurry, and unfortunately I fell into the second camp.
People pleasing is a BAD, BAD thing.
With family though, (as I notice all your descriptions are from) it is neither time bounded nor emotionally constrained since family don't really leave - they're always there, sometimes physically and certainly emotionally. Your first act of kindness to assist might well be voluntary but the second act could well be more out of a sense of obligation than choice and creates an increasingly involuntary burden.
I have found you have to be careful not to expect much in return otherwise you can start feeling resentful.
If you don't feel like doing something, you should stop. You'll eventually feel resentful and drained if you keep doing something you don't want to do.
I’ll help you with a career transition discussion. No matter how many hours it takes.
On the other hand when my best friend asked to help him move. I told him no. Laughed in his face. None of my friends dare ask me for physical help now.
I think the world is a better place when we specialize in things we are uniquely gifted at.
Same reason I don’t pick people from airport. I know I sound like a dick, and I don’t mind the downvotes, they are informative.
You have only so much time.
Packs of wolves do automatically specialize their individuals (eg alpha wolf spends more time looking after the others) - but the crucial part is that their roles change. If the alpha dies, another individual has to take their place, or the group becomes unbalanced and will probably die because of it. They are not necessarily „gifted“ at being an alpha, but they might be just good enough.
I also cannot imagine helping anybody move who laughed into my face when it was my turn. I actually cannot imagine being their friend at all, but that’s just me maybe.
If you’re so poor that you can’t hire movers I’d rather give you cash so you could hire someone.
You'd rather pay someone than be with them.