The only thing that you have proven is that the IA accepts user uploads. That is it, end of proof. The only party possibly acting irresponsibly here is the user distributing links to what is claimed to be infringing content and not answering a simple question about reporting or verification.
“Watch me distribute what I claim to be ‘warez’ using a neutral file upload service that I will not answer questions about reporting or verification about! My going out of my way to make this available to you is not the issue, this evil host is the problem for existing!” belies either a deep misunderstanding of how the internet works (also kind of indicated by repeatedly using the word ‘warez’ in 2024) as a whole at best or a weird bad faith attack (also kind of indicated by accusing a stranger of “white knighting” for asking if you verified or reported your link to Super Mario Wonder) at worst. So I am a bit confused as to what is going on here
What has your experience been like trying to remove infringing content from that site other than you distributing links to said content on other websites? Your confidence that this is so clear-cut flagrant disregard for the law indicates that you must have engaged with them extensively in some way other than sharing these files with strangers online.