I suppose they don't and I'm not disagreeing with you on that.
The IMAX situation may be different in that their trademark is very catchy sounding (2 syllables "eye"-"macks") and is getting pulled (by innocent human tendencies) into a lot of conversations unrelated to IMAX(tm) theaters. When people use words like "AMD" and "Honda", it doesn't seem to erode their trademark. But for some reason with "IMAX", and "google", and "kleenex", it does. In other words, most people haven't genericized "Honda" to the point of saying "I'm going to Honda my but to the grocery store."
Are the cultural references to "IMAX" trending towards trademark desctruction such as "kleenex" and "escalator"[1] or are the usages actually trademark preserving such as "AMD" and "Honda"?
[1]https://en.wikipedia.org/wiki/Escalator#Loss_of_trademark_ri...