A free VPN service still needs some way to fund its existence and although it may hide your computer in a bubble from the outside world you do share that bubble with other users and with the VPN. Note that in both cases your traffic is encrypted by both the VPN and Tor.
When you connect to the VPN first once traffic is encrypted it goes to the VPN server and then through the Tor network.
What vpn do you use reddit. People also use VPNs along with privacy browsers and other methods to help avoid the massive mining of your personal data. If none of this is important to you then you probably dont need a VPN. The VPN is a man in the middle who you are trusting with the traffic and connection data that is being generated in the background as you use the internet.
Other than their own website I do not know where an ISP would display these ads or who they would sell to. Some VPN companies choose to log this data. To understand which option is best for your situation lets look at each in more detail.
Regardless I would rather have personal ads as opposed to getting ads for a mixture of other VPN users. I keep hearing I should get a VPN so my ISP cannot track me. When you connect to a VPN service you are essentially just adding one more stop along your route to the open internet.
Use HTTPS everywhere and VPN can then only see who you connect to not any traffic contents. Youd probably just want a regular proxy specifically for that traffic – sending all of your traffic over a VPN provider like is the default with almost every VPN client will still result in the provider being able to snoop on and mess with. If youre a developer you should have something with fast speeds but if youre using the VPN to torrent or do sketchier things then you want a VPN with no logging and in a 2nd world country which means that if the FBI etc calls them they wont be able to lookup access points by time if they.
How to decide which Tor and VPN setup to use. Again its a privacy thing for some people. However heres a good article for you to decide if it makes sense.
Like you said it depends on what you will be using the VPN for each one excels at different things.