There's the additional cost that's a new and obviously straightforward barrier, but there's also the question of the content that was posted here, which was posted with the understanding that it would be freely accessible by anyone with a Rivals account, and what happens to it.
Without getting too far into the weeds, I (and you and every other poster/commenter) still retains copyright to their posts, though we've obviously licensed it to Yahoo!/Rivals for display here, and further, we can't cry infringement when someone quotes our posts. So it's a broad license, but not so broad as to permit an owner to swoop in and begin selling content that was licensed with the implicit and explicit understanding that it would be freely accessible.
Rivals is owned by Yahoo! and in its
Terms of Service it explicitly references
this Yahoo! page's main Terms of Service. At the latter, Yahoo! spells this out, and I've highlighted the key passages.
Conspicuously absent among the licensable rights is "sell" or "resell." This means that any purchaser of this
board who thinks they're also getting all of the
content created by users who each hold individual copyrights, is likely mistaken if they intend to put it behind a paywall. They'd need releases/waivers from each person who created content for which they want to now charge, or they'd be gambling that no one would push back.
Companies often gamble and overreach on IP issues because it rarely makes economic sense for nominal copyright holders to push back, so it could work. But if what I'm describing actually occurs, I'll draft a simple fill-in-the-blanks online form so anyone can formally complain and put the new owner on notice that they've exceeded the scope of the license I/you/anyone granted per the Yahoo! TOS, and are thus infringing.
Perhaps the new owners have no intention of keeping all the content, and will just kill this board so as to not have a competitor to its new product. No copyright implications there. But it'd be a huge shame because this board has real value. I believe a lot of what I said also applies to the football board, perhaps even more so because there's more traffic there, but my immediate concern is this board.