Xing’s Response

Wow, they’re fast! Points for customer service, for sure. Less than an hour after I posted my query.

But the response was ambiguous, if polite:

Thanks for your message. We appreciate your thoughtful insight into our Terms
& Conditions and will take your comments into consideration. Apologies if your
reservations prevents you from becoming a member.

What this means is that I may join, but I’m not going to post anything useful on the forums until the TOS is changed.