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What this means in practice
When a product link does carry a commission, buying through it costs you nothing extra — the price is the same either way — and the site earns a small percentage from the retailer. Every such link carries rel="nofollow sponsored" and, where the underlying program supports it, a tracking parameter visible in the URL itself; there is nothing hidden in the link beyond what any browser can already see.
What never happens
The compatibility checker and every "fix this automatically" suggestion pick a part because it clears the specific rule that failed, never because of which program pays more. See /about/ for the full monetization model, including a live calculator using the same numbers as the internal plan.
These results are for reference. Wiring must be installed by a qualified electrician. Mobile installations follow ABYC E-11; stationary ones NEC 690/706.