One of my biggest frustrations with NetNewsWire was that it scaled horribly. When starting the application, it would take several minutes to load -- not to refresh the feeds, but just to load all the feeds. My poor MacBook Pro would whirr away from all the work it took, and if on battery would drain it within 10 minutes.
I have a little complaint about, well, maybe it's not "abuse" in literal fact, but it certainly does not fall into "best practices" when it comes to publishing RSS feeds: post-dating posts so that they stay at the top of people's feed readers.
It seems to happen quite often. As I write this, this post by Richard Morse on Huffington Post has been sitting there for two days -- published on Friday, dated on Monday. Now I'm quite sure that Richard Morse may have just thought he was finding a way to publish his Monday blog post on Friday -- I can't say HuffPo is an "abuser" in post-dating posts -- but this is just one little incident of a posting behavior or tactic I've noticed a lot over the past weeks as I've worked to populate Shrook on a new computer. Personally I find it rather annoying.