Read the review here [0]; it's not abusive. It's probably the review of some guy who has been burned by half-assed Amazon shovel ware before.
[0] https://www.amazon.com/gp/customer-reviews/R2XHHHGM6BEUG6/re...
[0] https://www.amazon.com/gp/customer-reviews/R2XHHHGM6BEUG6/re...
The review might not be abusive, but usually a negative review like that is the cherry on top of a very abusive sundae.
They sure folded early in this case.
In the tech support jobs I had back in the day, the customer calling the product a piece of shit was just a form of greeting. Surprisingly often, we were able to win them back. We didn't have the option of being this thin-skinned.
I think the abusiveness is primarily in the guys forum post, plus posting the negative Amazon review without waiting for response from the developer.
But that's just my sensitivity level.