Nearly 70% of BGP paths have their ORIGIN attribute rewritten by transit providers - for traffic advantages, not correctness. We mapped the global impact and argue it's time to deprecate ORIGIN in route selection.
RFC 9234 lets routers reject route leaks on their own, using BGP Roles and the Only to Customer attribute. We measured who has deployed it, and found two Tier 1 networks unexpectedly stripping OTC.