Apartments and houses are designed for air flow. You don’t need a gap in your door to prevent mold. Mold will grow despite that if you live in a city that has high humidity.
Everyone should watch for mold. Check around windows. Behind the toilet tank. Above and around the shower. Wipe with bleach often.
You can also get a dehumidifier if it becomes a problem
Historically, do you know what they called Germans who voted for Hitler because of the economy? People that didn’t hold any hate for trans people, Jews, and other minorities?
Nazis. They called them fucking Nazis.