That's the address that we sweep the deposits to. There are a lot more addresses.
How do you have?
I'm fairly sure coinbase filed their UK tax return a few years ago and claimed to hold £3000000. If you secure your money well enough then you're fine.
It's a lot easier to do with a large organisation. As an example Bitfinex user a 4 from 7 multsig system with staff in diverse geographical locations.
And if you properly encrypt stuff and keep it secure enough then it shouldn't cause too much of an issue.
