I am aware that crates.io is uses first come first serve policy for publish crates but I find this use questionable an cause for the concern

What your seeing is what a first time rust user would see when visiting crates.io in the very first list of crates to select from.

If you look at these 0.0.0 crates you will find no code and you may actually never find code if you do not meet this users policy for reclaiming the name

some excerps from the current owners crate home page home

I've reserved some crate names on crates.io for future use.
I'm willing to turn over any crate names to interested parties under some criteria:
Your crate is a significant contribution to the ecosystem and not just e.g. some test project or something you never intend to finish.
You actually have it almost done so that its usable by other people

There is a bit of irony in there in that this person is trying to ensure the crate.io ecosystem is not polluted but the way they are going about doing so is what I'd consider polluting, in a way its defaming a good portion of the crate.io home page. The hub for crate discovery!