Keep in mind, VPN does not encrypt and secure the entire connection to the website you're viewing (or whatever communication protocol is being used). What it does is secures your connection to the VPN provider. From there (from the VPN provider) your connection may or may not be encrypted depending on whether the website you are using uses secure HTTP... "HTTPS"
The big value many of the subscription VPN companies provide is that you can connect to untrusted wireless networks (pretty much any free wireless network provided anywhere which you do not control yourself) and be able to turn that untrusted wireless connection into a secure & trusted connection... well, as must as you trust your VPN provider.
Some VPN providers do log your activity and keep those logs for a short amount of time. Website logs can be associated to VPN connections which then can be tied to specific customers. It is correct that ISP logging is blocked (or the free wireless provider logging) since all they see is an encrypted connection to the VPN provider.
TOR ( https://www.torproject.org/ ) would be better if you're looking to be anonymous. However, you still want to use an HTTPS website if you want your communication to be encrypted from you to their web servers (with only encrypted data passing through all the routers, switches and whatever else it takes to make the communication work). I tested TOR out maybe 6 years ago and it was extremely slow. No idea if they improved the speed since then.
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