To be honest that was actually my first theory, since the bots didn't seem interested in exploring the rest of the domain. I suppose there's no way to know for certain. I concluded that it must be an imbecile's attempt at harvesting, though, because the queries weren't really exploring the string space in any useful way. Here's a sample:
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&re&results_&results_pagenum=2980 HTTP/1.1"
"GET /index?author=2&go=Search&group=0&group_restrict=1&id=48&name_restrict=1&q&results_pagenum=5440&template=41&type HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&results_pagenum=33500&templat HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&results_pagenum=32640&templ HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&res&results_page&results_pagenum=39300 HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&results_&results_pa&results_pagenum=12340 HTTP/1.1"
"GET /index?author=2&go=Search&group=0&group_restrict=1&id=48&name_r&res&results_pagenum=6100 HTTP/1.1"
"GET /index?author=2&go=Search&group=0&group_restrict=1&id=48&name_restrict=1&q&results_pagenum=2920&te HTTP/1.1"
"GET /index?author=15&go=Search&id=48&nam&results_&results_pagenum=17940 HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&results&results_pag&results_pagenu&results_pagenum=37720 HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&results_pagenum=9360&template=41&type_r HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_restrict=1&q&r&results_pagenum=28040 HTTP/1.1"
"GET /index?author=15&go=Search&id=48&name_&results_pag&results_pagenum=10400 HTTP/1.1"
The only thing this is fuzzing is the query string parser. It's not testing the limits of string buffers, it's not using interesting characters, it's just brain-damaged. The fact that it's also fetching different page numbers shows it's trying to follow page links and failing badly at doing so.
The site gets plenty of sniffing from garden-variety pests. e.g. this half-hearted attempt to find a framework or two that I don't have:
"POST /__rsc HTTP/1.1"
"POST /api/auth/session HTTP/1.1"
"POST /api/auth HTTP/1.1"
"POST /__nextjs_action HTTP/1.1"
"POST /.action HTTP/1.1"
"POST /_rsc HTTP/1.1"
"POST /api/auth/callback HTTP/1.1"
"POST /_middleware HTTP/1.1"
"POST / HTTP/1.1"
(of course, none of these URLs exist other than /, and you definitely can't just POST to it)
All this said... I've seen that spammers regularly misconfigure their tools, they'll try to register accounts with names like #[X:\LISTS\NAMES.TXT] and it only makes sense that some other cybercriminals trying to get rich quick have a similar lack of interest in programming shit correctly. Generally people don't turn to script kiddie shit if they have a personality conducive to putting in an honest hard day's work perfecting their craft.