I like to leave reviews, but not when places insist attaching my name to them(Google). Not because I'm lying, but because I don't want retaliation in some form if I return, or some psycho showing up at my house.
Sure I could make a burner with a fake name, but that's too much hassle.
Perhaps make users upload receipt dated within last x days, scratching out some details, and writing their username on it. It would take an admin all of 5 seconds to review and click approve, which would delete the receipt and allow the review through. Perhaps after x amount of verified reviews, just whitelisting the user. So at this point, your IP, username, and date of purchase are known to the review system, so not 100% anonymous.
Reviews without a receipt, or in waiting, are allowed but flagged as unverified or unsubstantiated. Probably allow them to be viewed, but not by default.
And of course, your typical spam preventions, review bombing deletion, etc.
Basically the third-party would view your receipt and confirm you purchased the product, and then let you review it.
Amazon kind of does this sometimes, and it doesn't really help for all the various reasons that immediately pop to mind.
Judging-As-A-Service is an interesting concept, but in practice it's perhaps best left to the State.
I don't see how you can add all-party anonymity without it being gamed. (Except possibly for the judge - which would might not be a bad thing because it could mitigate some of the corruption possible under the current system.)
Just be careful that when writing a review you don’t lie or embellish the facts. As well as making it clear when you are just stating an opinion. “the goods I received were not of the quality I expected” (opinion based) vs “the vendor intentionally gave me bad quality goods” (speculative and not easy to prove).
"I didn't order this and you charged me too much!"
"No we didn't."
Someone going to go through the paperwork to validate it? What a pain for whatever 3rd party who does this.
Home improvement isn't exactly cheap, so I would hope people doing such things would be reviewing their receipts, particularly if they're in the business of constructing homes.
Sometimes the receipts are tracked, but often it's a "well we charged enough to cover our costs and we got what we needed to do the job, all good".