*American English grammar.
It's firmly 'Lego' in the UK.
Considering there is English grammar authority either, I guess you can never be violating English grammar rules? You are merely in conflict with some of the English dictionaries out there. So even if the scale is different, it's sort of the same.
Yes, and I find this argument quite tiresome (mainly due to its frequency) on English.SE - Google ngrams are really interesting, but it's not all I'm interested in. If something's a modern 'corruption' (by whoever considers it such) then all an ngram's going to show you is yes (or no) it has (resp. not) been corrupted.
Imagine if English (Language) teachers took the same stance. A+ everyone, if that's how you say it, you're correct, there is no wrong.
(And then is ESL different? Seems like racism is the effective conclusion!)
> Of course everyone is free to comply with these corporate demands, but the Lego Group has no authority over the English language to regulate it in this way. So if you want to feel guilty about using “Legos”, understand that the only thing you are guilty of is not obeying the demands of a Danish corporation, not for violating the rules of English grammar.