Free samples of small parts - That I can get behind as long as its not abused, I have never used such a service, but as a EE, you tend to build up common building blocks of parts that you then keep recycling forward into new projects, So there is a good chance of a forward return. As a company I have tried to request paid samples of parts, and the moment they started throwing NDA's my way i found another option. Its all about reputation, E.g. a supplier that was painful to deal with, I will likely from now on go out of my way to avoid them. Whereas a hobbiest getting your hands on 2 $5 chips that otherwise are MOQ of 500, may lead you to using them even when its a little out of your way.
Free hardware though, generally for personal use has almost no forward return, If you give a high series scope to a beginner, not only are they likely to require more support than a business, but Its unlikely they are able to buy the accessories for it, or upgrade it anytime in the next 5 years, meaning if you get a higher end job, your input on a few years old scope may not carry very well, while that IC they gave you will still likely be available for the next 5 years due to other agreements.