contracts store info in their contract like the balance. Say you use many mappings like that, from an address to an int. Wouldn't that be an issue over time, when many many many people use your contract?
Depends on the operations you are doing on the map I guess It will increase the gas price if the code is taking long time to execute or doing a lot of writes
Storage is always infinitely expandable on Ethereum
A contract doesn't store anything on its own. The Blockchain ledger stores the data and contract simply points to that. So a contract will not run out of storage space
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