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Casinos don’t rely only on IP addresses or gambling patterns to detect cheaters and multi-accounters.
When it comes to IP addresses, then, as usual, it’s better to read the casino terms as some of them do not accept multiple accounts from the same household.
I don’t know if this applies to Spinly, but you need to reed their terms before making such statements.
You can’t say that using the same IP address as another user to login into the casino is OK without reading the casino's ToS.