Shepherd - 8:54 pm on Dec 14, 2013 (gmt 0)
I'm not a good programmer
So how often is the OP's htaccess file updated. I doubt very often and hackers count on that. At any rate, if a hacker can get a page crawled with their link on it it's a win for them no matter how long the htaccess file goes unchanged. Even better if you're talking about:
some non-profit sites
like the OP stated they were talking about. A good, reputable non-profit type site would be a prime target for this type of hack.
But... the OP says it not possible in this case so...