some even have transactions:

https://playxo.com/bitcoin/1

https://www.blockchain.com/btc/address/1PDSZN2qgFcuay1vVRxYo...

is/was there a way to get vanity keys from the 'first page'?

also last one:

https://playxo.com/bitcoin/904625697166532776746648320380374...

if a visitor to this site stumbles upon a jackpot, will the server be informed?