I follow ya. I feel like busywork is probably one of the better words to describe what many in antiwork communities are getting at. Unfulfilling, often for someone else and to their greater profit/benefit over yours and others' own with seemingly no other purpose than that.
In a lot of ways it's a more familiar way of talking about alienated labor without putting people off.
Would you happen to mean readers with filtering tools? If so I'm interested as well.
I know Thunderbird technically has them, but I've had trouble making them work as effectively as I'd like. RSSOwl had some that were easier to work with, but stopped being updated. There's now a fork of it called RSSOwlnix, but I haven't taken the time to see whether it still works as well or not. May be worth looking into though...