My own game as well as the 3-5 other games i attend regularly are completely uncapped. You wanna sit down with 5000bb, knock yourself out.
To be honest, i don‘t like capped games, unless it‘s at least 400bb, but i wouldn‘t go so far that i don‘t attend as a matter of principle. At least its poker.
And yes, usually uncapped games play (way) bigger, but as already said, it really depends on the players.
For example:
- my second to last game the 2 biggest stacks at the end were 1.600 and 2.800bb with the largest rebuy at 1.000bb, average opening raise 6-8bb (let‘s say there were a few gamblers present

)
- last game, 50% different crew, biggest 2 stacks were 800 and 1.100bb with the largest rebuy at 300bb.
Blinds were both only at 0,25/0,50, but we only play every 3rd orbit NHL, and PLO, NLO, SOHE etc. tend to raise the average pot a lot.
that game grew over 10 years, and i never had complaints about uncapped rebuys, although one good friend and regular isn‘t too happy with the (inevitable?) increasing stacks and mentioned that a few times.
IMO the often heard statement that uncapped/deep pockets favor the better players isn‘t true, from my experience the better player will prevail one way or the other. But i gotta admit with equally bad players there‘s an edge for deeper pockets.