I’ve read the one for fakespot. Given what it’s designed to do then having your purchase history makes perfect sense. How else are they meant to make recommendations? If you really have a problem just don’t use that service. The only real criticism here is the name doesn’t imply they also make product recommendations. Nevertheless they explain that on the website.
I have skimmed the pocket one, and as far as I can tell they aren’t doing anything dodgy. Keeping information only to provide the service, and some anonymised analytics to see how it’s actually being used. The later is needed to direct development effort.
In summary: Not everyone is out to get you. Some information is needed to provide services.
Edit: sorry for there different comments, wanted to come back and do more research before I finished making a statement.