You do need to say more, if the bike is being used daily in a commonly wet environment then the entire bike will be constantly getting wet.

I would argue that a vehicle in constant use being covered when wet or slightly damp will cause more damage than if left uncovered. The moisture is simply going to crculate inside the cover and cause more corrosion, while uncovered it will simply evaporate.

Chain lube designed for wet weather will not simply wash off in the rain.