So tech I meant colloquially to mean software tech. The overwhelming number of companies you listed there are hardware companies which would also suffer significantly considering the amount of hardware good/fb/etc... Use. Amazon would also be hurt considering they are getting massive revenue from software companies. Also companies like Adobe would be massively hurt (say bye to their marketing analytics platform) and the fact that significant creatives use their products for advertising.
Companies like Oracle and Salesforce I would bet derive a significant chunk of revenue selling advertising and marketing analytics services as well.
Regardless of pedantry olad cratering would be a huge huge huge fucking deal for many people who work in software (at least).
Uh, no.
Apple, Microsoft, Cisco, Oracle, Intel, Qualcomm, Netflix, Amazon, IBM, Texas Instruments, nVidia, Tesla, SpaceX, Uber, Airbnb, PayPal, Priceline, Broadcom, HP, Dell, VMWare, Symantec, Intuit, Adobe, Salesforce, Tencent, Didi, SAP, Amadeus, Workday, Micron, HP, Foxconn, Huawei, Samsung, Sony, Panasonic, Taiwan Semiconductor, Hitachi. And on and on the list goes.
VS: Google, Facebook, Alibaba, Baidu, Twitter, Snapchat.