@Mr Ripple Not necessarily, a couple of products that this has happened with have never made it to market or have been modified and an updated version shipped out presumably because the feedback from reviewers has been that bad! It doesn’t happen all that often and 99% of the stuff I get sent gets reviewed.
Not all my reviews are shining gushfests if I spot an issue I will point it out e.g. my review of the Hellvape Max rda pointed out that the airflow didn’t work properly, great so long as you wanted a fully open draw but if you wanted to restrict things then it was ass about face and you ended up with the airflow over to one side of your coils or hitting the cotton! (and yes that review did get published)
The item that I felt was potentially dangerous had detailed reports going back and forth with the manufacturer and I eventually said I wasn’t comfortable using it. This of course runs the risk of them spitting their dummy out and never sending anything out for review again.