Even in the US, the dmca is irrelevant to individuals for the most part. You can outright throw the notices in the garbage without consequence. I've been doing that since it was passed. Some were legitimate violations, some were not. Either way the company wasted printing and postage.
Sharing is a form of advertising. If you want to promote a company or product there is no better way then sharing.
I remember seeing a video where a company exec said that they want to sell there product but they also wanted everyone to be using there pirated copy vs another company's application.
Most people won't pirate because it involves work. The people who do sometimes are the trend setters who can encourage others to buy.
Hell you can ignore DHS letters in some cases.