At least the crawling is impossible.
Showing a list of guilds is doable, but keeping it up to date is a huge undertaking and not worth the effort IMHO.
There are already lots of ways to find guilds.
Here on EsoUI
On the official forums (There are subforums for every server. Just got to the forum overview and scroll down to the bottom)
On reddit
eso-database.com
Just to name a few.