The limit on 401k contributions is quite a bit higher than that, and it’s an overall limit enforced by the IRs. Each employer can provide plans, but can balance rules on vesting and matching contributions. There are tests and audits to ensure it doesn’t primarily benefit higher paid individuals, and fines on them if it does.

For example, matching contributions are a good tool to encourage more lower paid employees,

But yeah, this is irrelevant to the actual wealthy