Tom Scott did a video in 2019 entitled "This Video Is Sponsored By [redacted] VPN" where he explains why a lot of the ad copy at that time was often misleading, and why he didn't take money from them:
* https://www.youtube.com/watch?v=WVDQEoe6ZWY
In 2022 he made video with an ad read from a VPN provider with more honest claims about their use cases:
It'll be great for customers. Prices should continue to come down.
Some jerk in a cube farm in Maryland does.
For instance, an embassy with clear telephone and telegraph lines knows they're being listened to, and subsequently is very careful about what they transmit. An embassy who has bought Crypto AG (https://en.wikipedia.org/wiki/Crypto_AG ) equipment thinks they are secure and transmits information they would never dream of sending if they knew they were being listened to.
Specifically:
* there is a presumption that a VPN, esp. a commercial one used by the average person for non-work related activities, is doing something shady. not entirely unfounded, though "shady" could simply be watching Brazilian Netflix
* the ISP can't see what you're doing, but the VPN can, and they're almost certainly using some sort of specialty firewalls / VPN aggregators / custom devices. Chances are those devices can do some deep packet inspection, and any lag would be perceived as using the VPN. Might even be able to MITM connections, maybe.
* DNS is often just as interesting or damning as actual traffic, and most VPNs will configure you to use their DNS to prevent leaks. but that means they know you're looking up "totally-legit-bitcoin-trade-site.com", or maybe "hardcore-gay-pronz.net" 3 times a day. they don't know what you're looking at while on those websites -- maybe you're ssh-ing to their server to fix apache? -- but they can make assumptions.
You may want to consider this Helloween deal: 3 years for 65 Euros: https://airvpn.org/buy/
I use AirVPN myself. It is not as comfortable and convenient as Astrill but works for me. (Disclaimer: No affiliation and I have not tried AirVPN in China yet)