SharedId: drop 3rd party cookie matching

[bretg]

Type of issue

Proposal

Description

Discussions with the Identity Committee have suggested that SharedId 3rd party cookies didn't gain widespread adoption and may not. Looking for community input on the proposal to drop the 3rd party cookie portion of SharedID in PBJS 5.0

[patmmccann]

I support this proposal; we never adopted because the value proposition was always unclear to me as an adopter of uid1 and given the sunset on efficacy. The pubcommonid feels cleaner without the distraction of sharedid. I look forward to the server side pub common id instructions moving to the prebid.org docs.

[durbanfrazer]

I also support dropping the third party cookie requirement, would make pubcommonid easier to reason about. I also expect most third party cookie work would stop being useful after chrome removes third party cookies.

[patmmccann]

duplicated in #6640