German hypermarket 'Metro' sued Microsoft over naming because they registered their name for just about any business sector , including computers and data processing. https://arstechnica.com/information-technology/2012/08/micro... They sued others, including public transport companies, and a disco place before. I believe LuLu is fine though, it's Metro AG who are far overreacting.

As long as the firewall doesn't start selling produce, there shouldn't be an issue

Apple and Honda can, I would be suprised if not Lulu too can...