That, and like others mentioned their flexibility, plus the fact that they're fairly reliable (maybe less than some good Iaas providers but a fair bit more than your consumer vps places). Moments ago I went to the hetzner site to check them out and got:
Status Code 504 Gateway Timeout
The upstream server failed to send a request in the time allowed by the server. If you are the Administrator of the Upstream, check your server logs for errors.
Annoying if it's you nextloud instance down for a minutes, but a worthy trade off if you're paying 1/4 of the price. Extremely costly for big business or even risking peoples's lives for a few different very important systems.
I doubt they're doing anything to secerative in the background. Not a fan of Bat or their affiliate link scamdle, but also not a fan of Firefox's ads, telemetry, trademark claims against Firefox forks, and accepting Google money for bad defaults - as I'm not a fan of Vivaldi being closed source and their adblock that doesn't block all ads.
Brave is great for somebody who doesn't know/want to configure defaults beyond optionally disabling Bat. If you can then Firefox & derivatives might give a better experience.
Brave is also Chromium based, but being a heavy fork it doesn't hold onto the worst parts, making it more alright.