Nearly half of the companies in Europe that call themselves AI start-ups don't in fact use artificial intelligence, a new report found. The research, published Tuesday by London-based venture capital firm MMC Ventures, found no evidence that artificial intelligence was an important part of the products offered by 40 percent of Europe's 2,830 AI start-ups. The report's authors individually reviewed the activities, functions and funding of start-ups across 13 EU countries. It did not name any of the start-ups involved in the study. The findings raise questions about how the term AI has become a blanket phrase for start-ups looking to attract investments and position themselves at the forefront of tech innovation.