Welcome to the forum!
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Good question
I don’t know the answer. -
The network will provide you with an address, you can’t choose one. So when you try to connect to the network in XOR-space, some nodes will reply, they’ll provide you with an address for some time and you’ll be able to take it. They’re the ones already close to a number (address) in XOR-space, so if the address was already used they would’ve known it, and provided you another one.
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There are a lot of addresses containing Safecoin. There can’t be more Safecoins out there than the addresses it uses to be on top of. Here’s some more info.