Why do cheap dehumidifiers under $70 only cover small areas?

Units like the ToLife and KeepGlad use Peltier (thermoelectric) semiconductor cooling rather than a compressor. Reviewers at aircare.best and multiple YouTube testers note these pull far less moisture per day — typically rated in ounces, not pints — and realistically handle bathrooms, closets, and bedrooms up to roughly 600 sq. ft. rather than the 1,000 sq. ft. marketing claim.