Originally Posted by
Alpha to Omega
Thor once tried to give Earth a free, clean energy source and a terrorist (who happened to be a mutant) decided to blow it up. He also gave away magical cures to diseases and ended droughts and the U.N. responded by nuking him and then attempting to destroy Asgard (with the resulting destruction of New York City being considered an acceptable loss).
And IIRC one of the explanations given as to why Reed doesn't put most of his inventions on the market is because they're dangerous in the wrong hands. Even something as innocuous as unstable molecule clothing resulted in a threat that could've killed millions when a clothing company stole a sample and tried to copy it.