Can it cause problems ff visitors use big letters to visit one's website?

I want to display domains with gib letters for each word in a domain name. E.g. GreatestStampCollectionEver.com.

Might that cause any problems? E.g. if a visiter enters (these) big letters to visit my website? Or are big letters ALWAYS treated the same way as small ones?

They will be treated as small ones but popular browsers.

So popluar browser do not make any difference between them, if I understand correctly. And not popular browsers might or will do it. That sounds like a problem, I would think.