cpanels online editor used to add them (maybe still does), possibly others do. It's easy for an online editor to accidentally do if they put some LF's before closing a textarea tag.

I always pretty much assumed that anyone's net traffic would be passed through some kind of analysis, e.g. looking for certain keywords, or maybe some kind of Bayesian thing based on known 'offender patterns'. Usually I think conspiracy theories are nonsense, but in this case I think it's only to be expected that it's already happening in at least some places where packets flows through.

So I suppose the only difference here would be more is stored, but if the stuff the government is 'interested in' already was, the problem of 'false positives' possibly already existed.