Is it impolite to crosspost someone else's post to another community on Lemmy without saying anything?

https://piefed.europe.pub/c/asklemmy/p/266879/is-it-impolite-to-crosspost-someone-else-s-post-to-another-community-on-lemmy-witho

Is it impolite to crosspost someone else's post to another community on Lemmy without saying anything?

I feel like on mainstream social media this is done pretty thoughtlessly and it's a norm but on Lemmy, with the much smaller userbase, I kinda felt…

without saying anything?

What do you mean, with this? (Serious question, if you’re wondering. I don’t do crosspost so I have no idea this works ;)

I mean like asking them if I can or adding a note like @user posted this on !community or something. Though it does show the crosspost already so maybe that covers it?
Oh, thx for the explanation. Like I said, I don’t do that myself but if I was asked if it was ok, I would not mind at all, quite the contrary.