How much individual user data is shared with blocklist owners?

I find it an incredibly odd coincidence that I have used NextDNS quite regularly and I have also become interested in a model building hobby and suddenly… one of the random ecomm sites is blocked by three of the lists

What would cause blocklists to add a random ecomm website to their lists? A gundam ecomm website is not an ad generator, it's not even a marketing platform. They barely even have email marketing.

This does not exude confidence in their abilities to recognize valid threats/risks.

Another example is Atlassian. This was recently blocked across the board. Atlassian may advertise but they are not an ad generator, they are not a marketing source, they are a  business product. 

Adding a business product to a block list across the board will significantly impact many users day to day workflow. There's no reason to block these. 

So I am looking to find the reasoning, I've seen several other VERY NICHE websites added to lists that seemingly are generated from my PERSONAL use of the service. 

The model is basically this: Innocuous source unrelated to tracking/marketing/ads is added to blocklists that prevent tracking/marketing/ads and are not prevalent on any known lists. 

Are these lists audited? Who adds to these lists, who maintains or verifies the validity of the entries? If no answer is found then why are these supported and recommended by the NextDNS platform? They are sometimes useful but over time they've blocked very prevalent resources like Google, without any warning whatsoever.