Let's make bets on how long it takes before the C&D hammer comes down hard on them.
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Trademark infringement is the unauthorized use of a trademark or service mark on or in connection with goods and/or services in a manner that is likely to cause confusion, deception, or mistake about the source of the goods and/or services.
> by using the domain name, you have intentionally attempted to attract, for commercial gain, Internet users to your web site or other online location, by creating a likelihood of confusion with the complainant’s mark
> Trademark infringement is the unauthorized use of a trademark or service mark on or in connection with goods and/or services in a manner that is likely to cause confusion, deception, or mistake about the source of the goods and/or services.
Emphasis mine, source https://www.uspto.gov/page/about-trademark-infringement
https://trademarks.justia.com/860/49/mongodb-86049805.html
I wouldn't rule it out they will simply dispute the domain name https://my.nic.io/legal/legal_dispute.html
> by using the domain name, you have intentionally attempted to attract, for commercial gain, Internet users to your web site or other online location, by creating a likelihood of confusion with the complainant’s mark