UID2 vs RampID vs deterministic first-party: the addressability stack

UID2 vs RampID vs deterministic first-party: the addressability stack
Heard: pubs slapping on every ID module 'to be safe' are bloating the wrapper and double-counting reach.
— UID2: open, email-hashed, broad buy-side adoption, but requires logged-in or authenticated traffic to seed.
— RampID (LiveRamp): strong CRM-onboarding match, but it's a walled commercial graph with a fee.
— First-party deterministic (your own login): highest match on YOUR demand, useless off-site.
Impact: Two IDs max in the wrapper — pick by where your buyers actually transact, not coverage FOMO. (sourced)