I am not sure if people on here know how PinchMe really works.
You get to grab/pick samples every other Tuesday or so, you get an email notification a day or two before. Those samples run out pretty fast, so if you don't log in to claim them fast, they will disappear. I've been getting awesome samples every month, like a tiny Birthday gift that I completely forget about until it arrives (hair masks, mini deodorant, dog treats, soap, granola bars etc.) It literally requires a click that is timed right.
You do not have to complete surveys like ever, unless you are rating an already received sample or want even more stuff and guaranteed samples. Each survey enters you in a lottery to win a big prize. If you complete a lot of surveys, you get a big box full of samples, some full sized stuff. IT IS NOT REQUIRED.
There is nothing shady about it. Companies do it for customer reviews and marketing, that costs them millions anyways. What does a tiny soap or deodorant sent to couple reviewers cost them?
If you use it correctly, pinch me is a great resource. Nothing full-sized and worth of hundreds of dollars just going drop on your lap... Unless you win a lottery at pinch me :)