I run a Mediawiki instance for an online community on a fairly cheap box (not a ton of traffic) but had a few instances of AI bots like Amazon's crawling a lot of expensive API pages thousands of times an hour (despite robots.txt preventing those). Turned on Cloudflare's bot blocking and 50% of total traffic instantly went away. Even now, blocked bot requests make up 25% of total requests to the site. Without blocking I would have needed to upgrade quite a bit or play a tiring game of whack a mole blocking any new IP ranges for the dozens of bots.