I worked for Luma when they were having a review war with Eero. Since Luma is defunct I don't mind straight up telling you.. we were paying a lot of money for positive reviews in order to make our rating match up with Eero's. We had an inferior product with a lot of problems, so it was a losing battle in the end.
Probably the most interesting part is that Amazon was one of our lead investors. We came to them for help, and they told us in a wink wink nudge nudge sort of way that our only option was to just keep buying positive reviews.