I have seen the following argument (summarized here as I understand it):
Despite the promises that VPN providers make, it is known that they will often monitor your traffic, collect logs, might share your information, and will collaborate with law enforcement. Renting a VPS and running an OpenVPN server on it and using that as your VPN, is better - because you have full control over the logs. Let’s assume we trust the VPS provider to adhere to their TOS and privacy policy.
To talk about a concrete typical usecase, I am thinking about how this applies to downloading illegal torrents. In my current view, the only scenario in which the self-hosted option makes sense is if you pay for hosting using crypto and reveal no personal information during the process. Otherwise using a VPS would be virtually the same as downloading it through your ISP - and in some cases even worse - because the VPS provider might be more easily pushed to throwing you under the bus if abuse is reported since this might be a TOS violation. On the other hand, a VPN provider has a much larger motivation to protect users against this because the way that users perceive these protections is fundamental to their business model.
So, is there a reason to self-host a VPN instead of using a VPN provider? If so, should the VPS be acquired anonymously, or are there ways to protect yourself while using a provider that you gave your personal information to?
I find the value of VPNs are often overstated when it comes to privacy. If you’re on a public WIFI and you’re going over HTTPS, which is pretty much all traffic nowadays, then all you’re leaking is the address you’re connecting to. And of course, if you are using a VPN provider then they have access to all the unencrypted information going through the VPN. This means the VPN provider will know what sites you go to, how often, etc. So I think if you do use a VPN for privacy then you definitely want to run your own.