If you've stumbled across nothings.org, you're looking at the personal homepage of Sean Barrett, the programmer behind the widely used stb single-file libraries. This isn't a store, a service, or anything that asks for your money or data. It's a personal blog and project showcase, and it has been online since 2001 without a single blacklist or threat report. That kind of longevity is a strong signal of legitimacy.
For a personal blog, the site does what it needs to: it clearly identifies the owner, links to his social media and GitHub, and loads fast. There's no privacy policy, no contact form, and no about page beyond the introductory text — but that's standard for a hobby site. You don't need terms of service to post code snippets and links to your music.
The bottom line: nothings.org is exactly what it claims to be. There's no commercial angle, no hidden agenda, and nothing to suggest it's a scam. If you're looking for stb libraries or reading Sean's game development articles, you're on safe ground.