It would be a bit difficult for one to determine is a slogan has been used before as they are so many betting platforms and one could coincidentally pick the slogan of one of them.

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My submissions;
• Betnomi - Stake with confidence
• Betnomi - Something for everyone
• Betnomi - Bet easy; win hard
• Betnomi - Welcome; Fasten your seatbelts

"Would edit if I think of more.