I'd recommend not getting stressed about people getting a million% extra, if the story really is true they're outliers and there's a natural bias for those stories to surface faster (or there's more to the story).
In my case, as I've gained experience that percentage has increased, specially when prioritising good experience over just pay at the beginning.
Though I'm closer to the end of my career than the start and now at the point I'm maxxed out what I can earn and it is approx graduate salary in US but no cheaper COL.
I need to find how to pivot.
Don't want to be a manager though. Craft path (e.g. staff developer) feels thin at the top, I.e. musical chairs ... not enough seating for the demand!
Therefore giving up the working for someone else game it has to be.