My biggest use for Yahoo Pipes was filtering podcast feeds - namely, filtering out episodes I don't care about. For instance, a podcast I listen to has episodes where they just talk shop and others where they play Dungeons & Dragons. I really cannot be bothered to care about the latter type.

I actually wrote a little, easily modifiable Digital Ocean function I've been customizing and deploying per feed I want to filter. It feels like a hack, and it is, but it's "good enough". It's been working reasonably well and runs rarely enough that it falls into Digital Ocean’s free tier.