Startups are bootstrapped, meaning founders would rather DIY than pay someone to do it. I completely agree some (or many) engineers may struggle with communicating their startup's value over social.
Honestly, though, if an engineer struggles to promote itself on social media, it likely points to a more fundamental problem with the startup's go-to-market strategy and audience segmentation.
You may find startups more willing to pay you to manage their marketing campaigns than only their social media campaigns. And since many startups want to bootstrap anyway, you can tell them the most efficient tactic for marketing at their stage is social media.
I agree with the other posts; too complicated. Plus, some people are grossed out by blood.
The name of your startup is definitely lower on the list of priorities when preparing to launch. I noticed eventyo.com is available. Just register something simple like that, and get back to work.
Without knowing much about you or your expertise, my first impression is you're about to undertake a project that may be too much to handle.
Before you consider launching any startup, you need to find at least a few people who believe enough in your idea to help you. If you don't have that network at this point, start with a small project and see who will help.
From there, start another, slightly larger project. Keep progressing. Eventually and ideally, you'll develop the resources to launch a startup.