I had an Amazon review removed because apparently mentioning that a competing product is more effective goes against their TOS.
I had a WordPress plugin review removed because apparently a critical vulnerability that got our site hacked isn't a valid reason to give it one star.
I had a local BBQ chain offer to give me a free bottle of sauce if I let them watch me give them a 5-star rating on Google.
I've seen tons of video game and app websites apply "anti review-bombing" measures to factor out thousands of low ratings for being supposedly off-topic, often for major games that they're financially affiliated with through sales or advertising.
And that's just for third-party websites. If a company's website has customer ratings/reviews for their own products, then the conflict of interest is too great to even pretend that they might be legitimate.
- leave unemotional matter-of-fact reviews so they can't complain for slander
- leave them days later so they can't link them to you
- leave them for businesses that provide incentives for 5-star reviews
- leave them when multiple reviews already complain about unethical actions taken by the owner
A 4-star HIG hotel in Bangkok once proposed I leave a good review to fix one of their mistakes. I firmly said I wouldn't and then mentioned the request in my 2-star review. The mistake was assigning "free breakfast" to the wrong room in a 2-room booking. Had to fight 3 days to get it fixed.
I think it would be interesting to be able to see an Airbnb place directly on Google maps (via a direct link), to compare reviews there; I'm working on a simple Tampermonkey script to do just that, will post it when ready.