Misinformation about Covid is deadly. Rand Paul is spreading misinformation - masks stop the spread of everything because it prevents bodily fluid particles from getting on everything, and also stops people from touching their face. Both of these are key vectors for disease to spread.
If corporations are to be treated as people, then it's good that they behave as if they have a conscience, and show an unwillingness to sacrifice real people on the alter of libertarian free-speech political correctness.
If I worked at YouTube I would be proud of their stance.