Yeah, it is possible but honestly, you can't rely on that 'full-time'.
Sometimes we might get lucky with some low to mid-competition keywords or just having awesome content.
But most of the time, SEO helps us stay competitive.
Without it, we're kind of gambling and could be missing out on better rankings.
I'd say it's worth at least getting the basics down.
Of course, like with most things in SEO, it depends on a lot of factors.
For a new website and niche, we might need some basic SEO to get things started, and if we're lucky, it could eventually take off and push the site to the top.
Other examples could be things like movie sites, quizzes, etc.
It really just depends on timing, what's happening in the industry, and what might happen next, if that makes sense ( :