This is really cool! I've always thought that one thing preventing major competitors to AWS/Azure/GCP is the lack of easy-to-use tooling for machine level monitoring like this. When I was at Microsoft, we built a tool like this that used Windows Firewall filters to track all the network traffic between our services and it was incredibly useful for debugging.

That said, as with anything from Meta, I approach this with a grain of salt and the fact that I can't tell what they stand to gain from this makes me suspicious.