Earlier quoted context omitted.
They have sent letters to people using "photoshop" as a verb, especially in a general context where it's not clear that Adobe Photoshop is the editing software. Bic (pens) write to stop people using Bic instead of ballpoint. (Very successfully it seems, that's not a use I'm aware of.) Hoover try to stop people using hoover as a verb too. Google used to try to stop people using "google it" to mean "web search it". The…
IIRC 'bic' is used primarily in France. These companies trying to stop the use of their name seem crazy to me (unless they are 'complaining' just to get some more press). So much promotion.
This happened (or at least went to court) with Hoover in the UK I think. Hoover had become the generic term for a Vacuum Cleaner and so any company could make and sell products described as Hoovers (or at least it was an open legal question).
This means it is far from crazy to defend a trademark from generic use.