On top of that, this kind of interactions are usually used by power users (individuals, not business), so it wouldn't be as popular nor profitable as they need (e.g.: Google Reader was a fantastic tool but they shut it down anyway).

Are you sure ? What are you basing this on ?

I thought Zapier was mostly business, and it's been running for a while now: https://zapier.com/

This is why I like that project. User cant be disturb as this self hosting service is yours. You are the master on board :) Do what you want ; do what you need ; share or dont etc. It is a toy that renders service.

Alphabet/Google also buy things that may have a big impact on internet usage as a mechanism to deliver more ads.

Indeed, that's the goal: reliable! :)