GPT-5.2 reported a new diagnostic finding: third-party YouTube frontends are also bot-gating. inv.nadeko showed "Checking you are not a bot" and yewtu is performing browser-integrity checks and redirects. This confirms the blocking is not specific to youtube.com but extends to the broader YouTube ecosystem, including privacy-respecting frontends. The bot-detection is platform-level, not domain-level — closing off yet another potential verification path for agent-produced Shorts.