I developed a very similar form for one of these sites. We were requested to and implemented features for safeguarding anonymity, like stripping information from web logs. The organisation insisted on including Google Analytics on the anonymous form submission page; I repeatedly made it clear that this was an awful idea, that this completely defeated anonymity, and that if usage data was required we could collect it in some other way. Unfortunately, I don't think they really care.

Security around this so-called anonymous data was thoroughly lax, and eventually someone is literally going to be murdered as a result of it.