Lucky for me I have plenty of karma to keep fighting this, because all this outrage is due to ignorance and emotional play. I am tired of companies getting raged on because no one is out there to defend them. Here are the facts:
1) The words Free and Trial, when paired, mean that a Trial of a product is free. This is not the same as a free product. It is in no way a lie, according to Webster Dictionary definitions of the words, for a free trial to charge after the period the the Trial is over. This is because the trial period was free but the word trial means, with certainty, that at some point the trial ends... this is when the product or service is no longer free. To claim you didn't know this was going to happen is dumb because the company would have changed to wording to "free product". This is a classic example of selective listening. It is not deception on the companies part, it is deception within each person who chooses to ignore the literal meanings of words and substitutes their own meanings, like you have.
2) "No obligation to buy" means you can make the choice to buy the product. It doesn't mean you are not signed up to pay for it. Much like the WoW trial I mentioned earlier, you could cancel before you get billed, just because you chose not to doesn't mean there was an obligation to pay. Obligation means required and it is clearly an option, one you must act upon, but it is still an option.
3) Nearly all of these companies return your money if you complain and return the products they sent. This should pretty much clear up all the outrage part, but no, its easier to portray the tactics as evil and pretend like people are getting screwed.
4) These companies are VERY up front about the terms. They are not hidden in the fine print, they are written on the cover so to speak. In the video professor example it is on the front page of their site how every aspect of the deal works.
5) Shipping is not part of a product. Once my father got a free piece of construction equipment under the condition he paid for the shipping and any other expenses related to the acquisition. Does that mean equipment wasn't free? No, it means someone wasn't willing to give away something and pay for all the costs of completing the transfer of the free product. Language has subjects for a reason. The word free can't just be applied to anything you want in a sentence, sorry.
6) None of these tactics truly meet the definition of scamming, lying, etc. The best you could go with is unethical/immoral.
You blame the marketers. I blame people like you who make up meanings of words and apply certain adjectives such as "free" and "no obligations" to the wrong or non-existent subjects. Once gain, ignorance is no excuse. I am not an English major or grammar Nazi. I am just pointing out the technicalities of why you are wrong. If I wasn't right these companies would be breaking the law because it is illegal to do the things you are claiming these companies are doing.