This campaign has been going for quite a while now, Ron McD has the most films but some include Batman and others. The idea was to get people's attention and tell them something they probably didn't know.
While I realise that most people here realise that tarot was and is a family of card games, they are, in my experience, in the minority. Most people know of tarot only has occult objects and believe they have an occult origin - much popular literature still promotes that idea. Read the lwb that comes with Fournier packs and you will find they allude to the old - and discredited - myth about their being part of ancient Egyptian initiation ritual. I've seen books on card games that describe playing card as being derrived from tarot which they claim had a ceremonial origin. The popular media and bookshelves are full of such misinformation.
Over the Christmas, my Sister's family was visiting us. Returing by train from a day in London, Patrick, my Brother in Law, and my niece had started a game of Tarot with a French suited pack. A man asked if he could have the other seat at our table and as I began to make room for him, Patrick asked if he would like to join our game, naming it as tarot. He asked if we were serious about these being tarot cards and I answered, yes, adding that this was a special pack for playing games. He then said that I could keep my seat and that he didn't 'do' tarot cards - and then left us to look for a seat elsewhere. This sort of thing is not at all uncommon, so I do think that the Ron McD films are serving a real need.
Of course, not all of us employ the same strategy. My own efforts have begun with something a little more informative but have been hindered by a serious lack of time over the last year. Still, I'll get back to it.