Windscribe here:
We compile our block lists from over 20 sources, including Spamhaus DBL. We have a hand curated whitelist to remove false positive domains from the existing lists. The whitelist is not perfect, so we invite everyone to submit their face positives to us, so we can check and whitelist them. We've whitelisted hundreds of domains in the last 48hrs based on user feedback.
PM or post false positives here, and we will fix it. The ones posted so far will be looked at.
If you don't wish to deal with this, you can disable ROBERT in the "My Account" section.
Lastly, in terms of performance vs Adguard, NordVPN "Cybersec", PIA "Mace", and Perfect-Privacy (which has awesome block lists) see our blog:
Meet R.O.B.E.R.T — Malware and Ad Blocker – Windscribe