"Bureaucrats" already tell you how to design your website. There is already laws against some forms of deceitful advertising, unfair trade practices, and information sharing and the like. For example, let's say I was working to design an airline ticket booking site...
https://www.transportation.gov/policy/aviation-policy/airlin...
>For both domestic and international markets, carriers must provide disclosure of the full price to be paid, including government taxes/fees as well as carrier surcharges, in their advertising, on their websites and on the passenger’s e-ticket confirmation. In addition, carriers must disclose all fees for optional services through a prominent link on their homepage, and must include information on e-ticket confirmations about the free baggage allowance and applicable fees for the first and second checked bag and carry-on.
How about those hotel "resort fees?" Currently they FTC says they are OK as long as they are disclosed before booking. So a hotel can advertise $20/night but when you go to book say "lol btw there's also a $30 resort fee." This of course makes comparison shopping impossible and exists for no other reason to deceive you. Rumor has it the FTC is going to backtrack on the policy and disallow separate resort fees.