It looks like it is, at least in the EU.[1] Substitutability also seems to play a role in the US, but I haven't read that article.[2] [1] https://eur-lex.europ

It looks like it is, at least in the EU.[1] Substitutability also seems to play a role in the US, but I haven't read that article.[2] [1] https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=LEGISSUM%3Al26073 https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=LEGISSUM... [2] https://www.jstor.org/stable/1072648 https://www.jstor.org/stable/1072648