Created just two years after Bitcoin, Namecoin came onto the scene in 2011 with the flagship goal of distributing the .Bit domain extension.
Aiming to be a censorship-resistent domain similar to .com or .net and being independent of the ICONN governing body.
This obviously let to some unsavory domains being created and in 2019, OpenNIC dropped support for .bit domains after malware abuse, among other things.
The idea was interesting, and I encourage you to peruse their wikipedia for a good history lesson. That being said, it appears Namecoin’s time has come and gone. If you look at their chart you can see the trading volume has been relatively miniscule, occasionally failing to break 100k or worse.