There are certainly some aspects of scrum that only apply to large teams but it can work in smaller teams too.
Like many things, it's a case of just taking what works for your company or team rather than blindly following all of it because "that's what you do".
I've seen it work very successfully with 1 developer and a 3 week budget just by cutting it down and adjusting it to only the ideas that are relevant to that size project.
Not sure if that still counts as scrum but it worked.
Ultimately, any project management plan is better than none and the sooner you realise there is a problem the less impact it will have.