Spoof my location.
Avoid giving trackers my IP address.
Avoid ISP throttling.
Hopefully my VPN doesn't log. At least my ISP can't log. I'm not concerned about state-level actors, just commercial ones.
Like in the UK when they wanted to ban porn (I think?). Something harmless today (legally speaking) can become an issue in the future.
some VPNs definitely lie about logging, maybe most of them. ProtonVPN is one of the least likely ones to do so given their transparency relative to other VPN companies, their ProtonMail service, their infrastructure, and their founder.
upstream logging is still possible, and protonvpn is the only VPN service I know of with any of its own infrastructure. it has one datacenter in switzerland and you can use it as a proxy to some of its third party operated endpoints in other countries.
In addition to that, I don't trust my current or any of the previous governments, and I likely won't trust any future governments. I also don't trust any ISP in my country further than I can throw them, due to government-mandated logging. My workplace does mandatory MITM proxying and logs everything, I'm working on getting around that.
Also many mobile plans throttle video to 480p, a VPN bypasses that.