To be honest, I never really did this before covid and I still tend to do it but I feel a bit odd doing it as nobody else seems to do it!
I’m not the only who touches my computer do, multiple people do so goodness knows what germs it would be lingered with!
every morning or after someone else has touched it, I always give it a wipe with a disinfectant wipe.
YABU - you must have OCD
YANBU - you are right to do that, It’s just good hygiene