Any rebranding will have backlash. It solved the issue of ZEIT Now being one _product_ whereas Vercel is the _platform_. It also brought a new focus on Jamstack and front-end developers.
I'll admit I'm biased though, as I'm a Vercel customer.
They could’ve just used ZEIT as the platform then. Vercel sounds like some generic VC created tech name. Their customer base is literally the exact opposite. Indie developers, people with Github accounts, technical engineers, engineering leaders. Not some Salesforce CRM enterprise selling to CEO’s marketing bs “Vercel” lol.