In the earlier days of Techdirt, Lego made multiple appearances as an IP bully. However, its IP bullying ran into some legal headaches as various courts pushed back again and again and again. The company failed, pretty spectacularly, in its quest to argue that no one could make similar, or even interconnecting, Lego bricks. Its patents long expired, and any copyright and trademark rights were much more limited.
For years, the company has relied on the fact that even with the ability of other companies to copy its designs, really only Lego could manufacture the toy bricks with the kind of exact precision that made them work properly. Knock-offs tended to not connect nearly as well. And Lego’s manufacturing was such that beyond the precision in the blocks, it could also make the blocks so cheaply that it was difficult for anyone to undercut them anyway. Finally, Lego’s brand is pretty powerful in its own right, and many people would buy official Lego products as the default anyway, because of the brand association.