Is rating affected if registered for a contest but didn't did any submissions?

If anyone who has registered for a contest but has failed to attend it due to some reasons and has not done any single submission. Then does rating of that person is affected ?

Which platform are you talking about? CodeChef doesn’t have any registrations for rated contests.

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No, it won’t be affected until u make any submissions, this is with respect to Codeforces and Codechef. Any other platform I dont have much idea.

I registered for Code Wars which is currently ongoing. I don’t know if it is ranked or not but it is organized by Tezpur University and also has cash prize winners.

Generally these contests are unrated.