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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
I agree that capitalization doesn't matter in SEO, and that it can only influence you negatively if you make mixed case URLs as they are harder to link to.
That being said, I have sometimes observed that SERPS are different on lowercase and higher case queries.
Using social media competitions to increase search demand for certain queries is very effective.