Oracle is/was laying off thousands as of August.
Within the past 12 months:
Peloton laid off over 4000. Snap 1280 (which is 20% of the company,) Shopify 1000 (10%.) Groupon laid off 15%. Salesforce, 1000. Microsoft 1800. Carvana (while not "big established" it's still a lot of people) laid off 2500. Tencent laying off 5500. Alibaba: 9500, ByteDance: 1000, Zillow 2300.
This definitely isn't really the first major layoff announcement.
Outside of big tech: Credit Suisse laying off 5000, Ford 8000, Telefonica 2700. Societe General 3700
A bunch more, but these are the one measured in thousands or otherwise a significant percentage of a company's workforce.
(By the way, not arguing with you, my point is that this isn't surprising, the writing has been on the wall for the past year, so an Intel layoff isn't a bellwether for things getting bad -- it's a lagging indicator of things already being bad.