People should take this list with a serious health warning. Firstly, a lot of this is just 'internet sleuth'ing and innuendo. Plenty of companies want to operate multiple services to be able to use different marketing and differentiation strategies. Secondly, the fact that the site is funded by affiliate links to a coupole of the big VPN services should really ring alarm bells. I trust we all learned from the Mattres…
This is why I self host algo vpn. I seriously doubt my hosting provider would jeopardize their business by snooping on/messing with a vpn given the breach of trust would cause large customers to ditch them.
1. Tunnelled & encrypted (and in most cases, easily identifiable as VPN) traffic coming from your VPN client to your server
2. Untunnelled traffic from your server to whatever server endpoint you're visiting.
Correlating the two, even when it's a massive multi-user service, is not difficult for a hosting provider with half a clue to do. Especially when handed a police order (which they usually have an obligation to not tell you about).