The diff between 1.8 and 4.2 business is that the latter sends mass emails to the customers saying "write us a nice review on TrustPilot, and maybe you'll win a $50 gift card". (Although, in case of the app, we just asked nicely, and many people clicked the banner and went on to give 4* or 5* ratings in the store, for free).
Having said that, if company doesn't care about 1.8 rating and has no actions to change, it's probably a bad sign...