ShadowShopper and Shadow Agency aren't the same, as far as I know, unless they're related, and I don't think they are. ShadowShopper isn't a mystery shopping company; it's a job database. They're pretty useless, for the most part. But I got my start in mystery shopping, back in 2013, through them. I was on one of their "try out our paid service for free" deals and applied for something. Not sure what; maybe a generic application. But Ardent contacted me through that for a training they had in my area, and six years later, I'm still shopping. If I recall, though, many of their leads are for product demonstrations, inventory taking, etc. I wouldn't pay to use the service, but it can't hurt to try the free version -- as long as you don't fall for the scams that pop up on there.
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.