Good question! May I suggest some kind of poll or questionaire to gather what the majority thinks constitutes oss hostile or anti oss behavior. Maybe it would also be good to question the purpose of this list to maybe find a logical cutoff point that way. Example: If naming and shaming is the purpose then it might not matter if anti right to repair or just not giving any api access since it makes controling stuff you bought harder by choice.

I always choose this kind of philosophical approach since it helps me make decision.