Don't think that's ever been a problem anywhere close to Paris climate. It's not that humid and it's not that hot. The difference between inside and outside climate is not that extreme.
And if humidity is a problem, you are dealing with mold, not actual wet floors. That is if the buildings are not well engineered and it would show in the long run, not during the gamee.
Just send them a GDPR deletion request by mail and they will regret not having an online flow (that's free, obviously). Do they operate in EU? No court will allow this fee and i doubt they risk a trial over 20 bucks.
Not a native speaker. That's what I was taught. Subjunctive wasn't a thing in my English lessons. Common phrases like "I wish I were you..." were introduced as a non-standard alternative...