Bets should have a minimum to ensure economic stake.
The specific issue is bet_amount can be 0, allowing spam or trivial battles.
Likelihood: Medium
User sets bet_amount = 0.
Arena occupied with no-risk battles.
Impact: Low
Spam of arena and events.
Dilution of betting mechanics.
Go on stage with bet=0: succeeds, occupies arena cheaply.
This is Informational, there is no security impact on the protocol from that.
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