As for BT - they're just one broadband ISP operating primarily in a single country. I don't see that moving the needle - you're missing CDNs, traditional large scale "tier 1s" and cloud or large hosting networks.

RPKI got to where it is today through community engagement by folks like Job S. and others - hitting the conferences, direct engagement with operators and raising the bar from a software quality and standards perspective - which still continues today. That's how you get the internet to adopt something that is considered the new normal.

As for your ISP list - I know there are networks listed there that aren't running scion in a production capacity (perhaps you can run scion in a virtualized environment on top of them which is different than those companies running it on their production network).

As for the block chain - it was all the Sui stuff.

This is a meaningless benchmark - for a small group of trusted big enterprises with insurance policies and mutually signed contracts you could've just as well used OSPF with zero filters.

The benchmark would be adoption by an actual large number of parties that don't/can't talk to eachother spread across the world. With a large chunk of them being malicious or incompetent to the point of being effectively malicious.