Just like the hanging magnet is pulling on the car, the car magnet is also pulling on the hanging apparatus. Unfortunately for the car, the apparatus is attached to it, so it all cancels out.

Will I use it? Absolutely not.

Do I hope that it gets used by others? Yeah, at least a bit. Because if Meta assigns more engineers to work on fedi tech like improving ActivityPub that would be a huge win for the fediverse in general. That assumes they actually contribute to open source, but Meta/FB actually has a reasonable track record there.