Ok. I understand why you cannot have Lego in your model any longer. However, the reason I never wanted to remove it, and now regret doing so, is that much of my traffic came from searches of the word Lego. Most of my popular models are just trays and stuff, but people use them for sorting. I removed the term from all of my models to go exclusive and all of my stats have dropped, as I feared. I think it is strange that one side of the pipe (creating models with Lego) is cut off, but the other side (searching for Lego) is not. Why not have the same message you have when you try to update a model with the term. Or simply redirect the search “brick” and notify the user. I think there are multiple options but I think the person searching needs to know that the term is not allowed in models any longer
One of the reasons Lego is so active legally is that they want to reduce genericization of their brand. (loosing the trademark due to it being used as a generic term in the public - for example Aspirin was a Bayer brand and Mc Donalds just lost Big Mac in the European union… )
With Lego it´s de facto already fully there but they have been legally very active especially crushing alternative smaller brands to avoid it getting public enough knowledge that there are other brick brands out there to a degree judges know it.
The search behavior is kinda proof for that - people will search for lego and every half way decent search algorithm will find any kind of related brick but if you put the Lego brand name in your product Lego will sue you out of existence.
You could try “lego compatible”