A legendary member had explained how these addresses are generated.
It's not that link, however generating an address like this i think it takes lots of years (or simple impossible) using vanity.
Q7 i think it would a good idea to have an easy-to-remember address but the possibility is zero.
That link is to a sort of "mining pool" that Otoh started for for creating vanity addresses, which is still operational. A few years ago he made this post showing the "longest" address his "pool" had managed to generate. I think generating anywhere beyond nine chosen characters is very difficult and too time consuming.
The longest to date generated by
ThePiachu's Vanity Pool &
thread btw is 9 chars after the initial 1 for 1
ELiZABETHdzGTuQeg2RnCcWBMVo3ySfTz that I'd requested as a gift for someone.
Vanity addresses could be useful if used by top rich list holders such as exchanges to let people know who owns a top wallet.