Here are sum old uploaders I found
I didn't check through their archived files yet (you can browse wayback machine by URL prefix if u didn't know), but u can probably find interesting stuff of possibly varying dubieties of legality if u do

https://web.archive.org/web/20021007221823if_/http://mc6800.dyn.dhs.org:80/UP_LOADER/UPFTP/UPFTP.PHP
https://web.archive.org/web/20030812002035if_/http://43.234.158.235:80/up/
https://web.archive.org/web/20030410201256if_/http://strawberry.3utilities.com/cgi/up/upload.php
https://web.archive.org/web/20030810103940if_/http://www.mikan.ath.cx/bbs/p/upread.php
https://web.archive.org/web/20030925165825if_/http://otyaotya.s4.x-beat.com/cgi-bin/file/upload.cgi
https://web.archive.org/web/20021219102551if_/http://www56.tok2.com/home/tokara/xxx/index.html
https://web.archive.org/web/20030202032015if_/http://sugiue-t.s3.x-beat.com/cgi-bin/upload/upload.cgi
https://web.archive.org/web/20030408173624if_/http://cool.s3.x-beat.com/cgi-bin/Inter/upload.cgi
https://web.archive.org/web/20021225092251if_/http://203.141.139.82:80/~upload/cgi-bin/upload.cgi
https://web.archive.org/web/20031205171348if_/http://milk-tea.ath.cx/~toshi_52/cgi-bin/uploader/upload.html
https://web.archive.org/web/20021209031352if_/http://rosecgi.zero.ad.jp/~zbn11032/upload/
https://web.archive.org/web/20031007014411if_/http://www.uploda.net/cgi/uploader1/index.php
https://web.archive.org/web/20030708025614if_/http://uptest.ddo.jp/uploader/
https://web.archive.org/web/20030428170101if_/http://uploader.windy.cx:80/
https://web.archive.org/web/20030713125554if_/http://sobchan.no-ip.com:80/cgi-bin/irc/
https://web.archive.org/web/20030614085250if_/http://www.goodkey.net:80/~sakuran/up/index.html
https://web.archive.org/web/20040324055407if_/http://upld.komugi.net:80/
https://web.archive.org/web/20020830102555if_/http://tool-ya.ddo.jp:80/2ch/trash-box/index.html

There is a small group of Ayashii styled ones mixed in, but I don't think they are actually related to any Ayashii World - I'm excluding them as the list is for comparing their styles.