The way it works is this: You can sign up for a proxy rotator service that works like a regular proxy except every request you make goes through a different ip address. Is that a botnet? Yes. Is it also typically used in a scraping project? Yes.
It can absolutely be that, but that requires a confluence of multiple factors - misconfigured scrapper hitting the site over and over, a big bot net like proxy setup that is way overkilled for scrapping, a setup sophisticated enough to do all that yet simultaneously stupid enough to not cope with a site is mostly text and a couple gigs at most and all that over extended timeframe without anyone realising their scrapper is stuck.
Yeah I know, I've done scrapping too.
It can absolutely be that, but that requires a confluence of multiple factors - misconfigured scrapper hitting the site over and over, a big bot net like proxy setup that is way overkilled for scrapping, a setup sophisticated enough to do all that yet simultaneously stupid enough to not cope with a site is mostly text and a couple gigs at most and all that over extended timeframe without anyone realising their scrapper is stuck.
Or alternative explanation: It's a DDOS