Mythbusters did a test and found hand blowers just blow the germs around and evenly distribute them throughout the room. This is probably not a bad idea.
I stopped using those gross things years ago.
I _FINALLY_ won my campaign to get these things turned off at my company(I've been whinging about ever since I saw that Mythbusters episode). It only took an economy crushing pandemic, but they finally believed. Now I just need to make sure they get taken off the wall and scrapped so they aren't turned back on, ever again.
This has been known about hand dryers for decades. Of course the manufacturers try to pass them off as “more sanitary” than paper towels. Note you do not see them in hospitals.