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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Personally I don't think it's worth wasting much time tracking. If someone has to inflate their rank for respect, they know that respect is hollow and unsatisfying, and maybe sympathy is a more appropriate recourse.
That said, maybe a badge of dishonour next to their name for 30 days? And some tips on rehabilitating themselves...
I think you can never have too many katas, and beginners need katas like these, which they won't necessarily find easy.
Worrying about issues caused by there being too many katas is worrying about problems that don't exist. If a beginner wants to spend 30 hours of their life doing 300 katas like this one just for a hollow level 5, they're only cheating themselves out of progress.
As long as we each know how much we've worked to achieve our own scores, we shouldn't worry too much about how others achieved theirs and just be proud of ourselves for getting to the level we're at.