I can't tell you the amount of good colleagues I've seen leave because management was too stubborn to give them a 7% raise. The most baffling thing is that they'll have no qualms (or perhaps no choice) to subsequently replace them with someone else for at minimum double of whatever 7% would've cost them. This causes a cascading issue where people are annoyed that new hires get such a big boost while the current staff have to fight for every measly percentage increase, so the older employees slowly trickle out.
I've had it happen myself too. A place I really enjoyed working at, I found the work great and had a great relationship... But the CTO stubbornly refused to give me a 9% raise. I referred my friend and started looking elsewhere. I got a roughly 30% paybump, and my friend got hired to replace me for roughly 20% more than what I asked for.
So why on earth would I be loyal? The people running the show are hilariously short-sighted and can only see the beacon emanating from their VC buddies shoveling money their way, so whatever, I don't care ultimately if something I worked on dies or not.