A tech company employee who went viral for filming her firing and sharing it on TikTok says her video has brought a flood of support. “I don’t regret sharing that,” ex-Cloudflare employee Brittany Pietsch told The Wall Street Journal. “I have received so many messages of people telling me, ‘I wish I would have stood up for myself the way you did.’ ” Pietsch, 27 years old, shot to social-media fame last week with a 9-minute video of herself repeatedly asking two Cloudflare representatives why she was being let go, and why her manager wasn’t on the call. “To be...