As a long-term Lego fan it disappoints me to see them descending to such tactics.
Lego is a good example of the execution being more important than IP for business success. Lego bricks are extremely well made to very tight tolerances (certainly tighter than any other childrens toy). The fact that millions upon millions of plastic bricks have been manufactured that are ALL compatible with each other and will interconnect strongly is quite incredible. Their competitors simply don't match such quality.