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@gbj_tester
Normal dérailleur chain is plenty strong enough, but the cutaway/chamfered side plates and bushingless construction are designed to make the chain come off the rings and sprockets as easily as possible. Ditto for rings and sprockets designed for use with dérailleurs, they have lowered and chamfered teeth to derail the chain. Wippermann make good cheap singlespeed specific chain in 3/32 and 1/8, and singlespeed specific sprockets and chainrings with a full complement of tall teeth are available from cheap to very expensive.
No, it's the chain getting longer as it wears. It's also nit-picking pedantry, since the effect is the same, but the material doesn't get elongated, some other material gets worn away and the structure gets elongated.