This might already to be well known to people, but just in case...if you're using Venmo and have it linked to a credit card, you might be getting cash withdrawal charges everytime you pay someone with Venmo.
I don't use Venmo, so I don't know if it warns you of this. I just happened to notice it on my wife's credit card statement, which I usually don't review. (Her card; her business. She asked me to look at it.)
She didn't remember seeing any warning.