Would you be asking the question if the crosspost were a different forum?
Personally, I have got no trouble with the crossposting of content anywhere, so long as it doesn't lead to a rights issue.
If you're more concerned it's going to lead people here who will have a detrimental effect on the community, well, a) that's a problem anywhere with open enrolment and b) we have different mods, rules and community standards.
Otherwise, it's the Internet. Crossposting and reposting happen. A lot of the time you just don't know it.