[throwaway7767]

Tor does nothing of the sort. In order to throttle a client, there would need to be a central authority that could identify connections by client, which would very much defeat the purpose of Tor. And besides, how would it deal with multiple Tor clients for the same user?

That said, it's not particularly effective a as a brute-force DoS machine due to the limited bandwidth capacity and high pre-existing utilisation. Higher level DoS by calling heavy dynamic pages is still possible.

The parent didn't specify that the outages were during the period that the scraping was coming from Tor. It's equally possible that it only started affecting availability after they blocked Tor and switched to cloud machines.

All that said, screw people who use Tor for this kind of thing. They're ruining a critical internet service for real users.