Is it Lashon Harah to rate a Jewish owned company/product with a rating less than 5 stars? (4 stars?)
If yes, would one have to be mevarer to see if a company/product is owned by a Jew before giving a rating?
If the company is a large company, then giving a 4 rating is not going to cause them any damage. Additionally, you don’t have to check if the owner is Jewish or not.