But HTTPS will stop them from seeing the content you actually see on the web.

Sure, but that was true for your ISP as well. I'm not questioning what data you're leaking. I'm saying that it's the same data and you only change who you leak it to if you choose to use a VPN.

It seems like you've thought about it and you have made an informed choice. That's great and I don't have anything to argue against here. The only reason I commented is that there seems to be a trend of "just use VPN and your data is protected" mentality, especially with all the ads in gaming/tech related content. There was no way for me to know if you or the other users who would read your initial comment were aware that using a VPN doesn't magically protect your data if you don't know who your provider is, so I though I'd point it out.