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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.
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Definitively not an issue. See there: https://docs.codewars.com/training/troubleshooting/
And to answer your question: yes, more than 69,000 persons did (see at the top of the page).