Because newbies don’t know jade. Or coldcard. If you are just discovering all this, you start with the things that are most talked about or most recommended in the „crypto space“. And ledger puts a lot of effort into advertising. I myself only learned about the jade after i joined nostr in February. And i discovered bitcoin in 2021.

Try to get into the shoes of a newbie. Google bitcoin hardware wallet with e fresh browser or look it up on youtube.