So which is it? DDOS attack or "AI" scrapers?
Scrapers because DDOS implies that it's malicious rather than accidental and there's no reason to think that.
A sufficiently stupid and egregious AI scraper is indistinguishable from a DDOS attack.
Edit: Fabian2k was ten seconds ahead. Damn!
Sufficiently aggressive and inconsiderate scraping is indistinguishable from a DDOS attack.