A key can make an unlimited number of signatures.
Signet isn't intended to be particularly secure in any case, as it's just a test system, but the reuse of keys doesn't do anything in particular to harm its security.
Topic: Why signet blocks reuse the same keys? (Read 133 times)
As far as I know, signet blocks by default have a challenge set to 1-of-2 multisig. That means each block have to reveal a valid signature for one of two keys. Does it mean that for one of those keys, there is always at least "number_of_blocks/2" valid signatures? If so, does it mean that each block is pushing us closer to the situation where signet keys will be compromised and that signet will turn into similar network as testnet3, where blocks are unsigned?
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