@atomicpoet for me is the #opensource aspect of it combined with decentralisation, data ownership and data persistence.
There is no point in opensource code, when it is running in somebody else's infrastructure which we cannot audit (ie. Signal).
Anyway, those are the reasons that made me come to the Fediverse... but the most important question is about the reasons that make us stay... and those are all about the people and the quality of the engagement here. 😊