I mean the main thing is you gotta then trust the vpn. you isp can see all sorts of stuff and at a hotspot same for what is running that. The vpn just becomes a new endpoint but many lay out that they run on servers that don't have logs and everything is in ram. Assuming you can trust them enough to do what they say then you know that they can't really look at your history and such. I don't use one but I could see using one and if I was living in a disposable income mode and that disposable income was high enough I would use one.