I like to believe it is, I’d like to get crossposts on my communities (if they adhere to the guidelines, of course) and try to put an effort into crossposting for relevant communities that I know. I don’t think its spam as long as you’re not, like, cross posting a single image into 5+ communities every time.

Not everyone is constantly browsing Local, and even if they do, you might lose something here and there with the sheer volume of contributions. Cross posting to specific communities will highlight it to the people who are subscribed, and also help the administrators.