usually sent to the same address if want to save it. I think it's very dangerous and will be a target. everything is gone without a trace.
The amount of funds on one address doesn't matter. A properly created cold address won't get compromised. And if you mess up, spreading your funds on different addresses doesn't help you either.
The trend always increasing, even though on August 30, 2023 there are more funded addresses than today.
When transaction fees go down, it's a good time to
consolidate small inputs. Many people (and casinos) do that.
There are 23,589,958 Bitcoin addresses with at least 0.001
BTC in them. For 0.01
BTC, it's 12,374,540 addresses.
35,705,480 addresses have at least 0.0001
BTC, and more than a million addresses hold less than 500 sats.