I'm not 100% sure on the etiquette myself.
From what I have seen in the past, some users will say something along the lines of "anything goes, share what you like" while others would suggest a more measured approach to other people's content.
I understand the latter but in my neverending quest for the perfect card also welcome the former.
In the past Pathos / Eros seemed to be happy to share cards when asked for them. I'm not fully aware of the reasons, but they are no longer active on this forum now and use Discord instead. May be worth out of courtesy checking with them first there.