

I am also not sure for Croatian and other languages that have kupite instead of kupi. In slovenian kupi would be better suited for slogans or brands since it is used for a single person. But I am not sure since some languages are only similar but I do not speak Croatian or other languages. However in Slovenian to put something on a panel on a protest I would use “kupujte evropsko” meaning something like “you all should buy european”.
However all versions can be used in all mentioned occasions. I just mentioned what would be better suited for what occasion.
Omg. Again? Will they never learn? Their users do not want ads at all. But they are proving again and again they became just an ad company.
Check Librewolf or Ironfox on android.