Personally, I don't. I pay for maximum bandwidth, and if there's a spike it will just throttle. This has its own set of problems of course but at least I don't

Personally, I don't. I pay for maximum bandwidth, and if there's a spike it will just throttle. This has its own set of problems of course but at least I don't get surprised by the bill. They do have "flexible" schemes where the bandwidth can increase as demands grow (of course, you pay accordingly), but that's not the default. (I'm hosted by https://www.gandi.net/ https://www.gandi.net/)