Any publisher that cares either way should have a Terms of Service or Acceptable Use Policy for their RSS feeds published on the site. Some do, some don't.
Some TOS allow non-commercial use for unlimited reproduction with certain terms in place, like leaving the permalinks intact. Some allow it for personal use in readers only.
If there is no TOS/AUP, it could be reasonably assumed that it's OK to use it however you see fit.
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