I'm a member of Stack Overflow, Web Applications Stack Exchange and Meta Stack Overflow. However, I thusfar only contributed to Stack Overflow, where I have a reputation of 166 (based on a total of 30 aswered questions) at the time of my writing this.
When I tried to submit an ad for my open source project Cascade Framework as an answer to the question Open Source Advertising - Sidebar - 1H 2014, I noticed it was protected by a background user to allow only users with a minimum of 10 reputation points to respond:
protected by Community♦ 30 mins ago This question is protected to prevent "thanks!", "me too!", or spam answers by new users. To answer it, you must have earned at least 10 reputation on this site.
While I understand and support the protection of questions by means of a reputation system, I don't think it makes much sense not to consider ones reputation on Stack Overflow or other Stack Exchange communities as it restricts users who already have a good reputation in one Stack Exchange community posting in other communities, which -- at least IMO -- doesn't make much sense for a community dedicated to Meta Stack Overflow discussions.
Why doesn't the "protected by" flag consider statistics from other Stack Exchange sites?
I just noticed the same restriction also applies to upvotes and other privileges.
I understand that someone's reputation points at Amateur Radio Stack Exchange would be considered irrelevant to Biology Stack Exchange, but I do not understand how one's reputation points at Stack Overflow would be considered irrelevant for one's privileges at Meta Stack Overflow.
IMO, reputation points at other communities should at least be considered when those communities deal with related subjects.