I noticed few commenters mention something like a rule: If you say your domain is for sale, they will take it from you because..... And was wondering, few years back, twitter was sold to mr Elon. I will just say it like this: Did they lose all their trademarks and rights to all domains, if someone register twitter.cc or twitter.it or similar, because twitter is for sale and they did not need the trademark for business anymore?
The concern is if you own a domain that you don’t own the trademark for.
Twitter owned both the domain and all trademarks so it’s a non issue.
Basically in fairly limited circumstances you can have your domain taken off you if someone else holds a matching trademark. Saying you are selling it can go some way to demonstrating you are not holding it in good faith.