Vercel adds user-code training defaults

This is a trust tax disguised as a settings change: Vercel is turning customer code into training fuel unless users actively intervene. The real issue is less the policy itself than the default, because a lot of hobby users will miss the notice and only notice the implications later.

• –The official policy sets a March 31, 2026 effective date, so the timing matters as much as the wording.
• –Vercel draws a hard line by tier: Hobby and trial Pro are in the training pool, paid Pro is optional, Enterprise is excluded.
• –For teams shipping proprietary code, prompt data, or internal tooling, this becomes a vendor-risk and procurement question, not just a privacy preference.
• –The move fits Vercel’s bigger AI push around v0, AI Gateway, and related products, but it also invites skepticism about how much user data should subsidize model improvement.
• –The backlash risk is especially high because free-tier users are the least likely to read policy changes closely, yet the most likely to feel the impact.