Disclosure: I used Claude to do the first pass of the research and to build the page. It fetched every source URL and I checked the ones it flagged as uncertain by hand (Norton, NordVPN, hide.me, CactusVPN).
Results: 23 have at least one audit. 48 have never published any. 30 audits in the last 24 months, almost all no-logs attestations; only a handful cover apps or infrastructure.
Surprises: NordVPN's reports are only readable inside a customer account. Cloudflare's KPMG examinations cover the 1.1.1.1 resolver and never mention WARP, so WARP is listed as unaudited. Several big names have exactly one audit from years ago.