The Spaces Protocol, which anchors human-readable names directly to Bitcoin without soft forks or new chains, limits new top-level spaces to roughly 3,600 per year.

AT MOST 10 spaces per day through an open auction process. Bids are burned. The highest bidder at the close of each auction wins the name. Once claimed and the root is committed, handles issued under that space never expire.

Article: https://bitbane.com/bitcoin-names-are-moving-fast-live-auctions-show-the-real-scarcity-in-spaces-protocol/