I use this on a client's website. Just happen to know about the fake reviews. I have a question though. What are the reviews about? The plugin or the product? AFAIK the reviews are for the functionalities of a Plugin. In my opinion the plugin works well. Even though it just ads javascript on the frontend — it is supposed to do that only.

Productwise accessiBe is costly but as a plugin it deserved 5 stars — that's why I rated it with 5.
Coming to the 1 star reviews that are already there. I don't think the reviewers have used the tool at all.

One review from @sailorgoodway on WP.org is this:
"Huh, one line of Javascript gives you website accessibility. I am afraid not, there is no quick fix for accessibility. It takes a lot of effort and that effort has to be ongoing."

I am unable to decide if this review is real. It is true that it takes a lot of effort to be fully ADA compliant but this review has nothing to do with the plugin or the product.

Only one of the three current 1 star reviews is not motivated by any marketing approach.