> Does an unworthy Wikipedia bio page somehow harm anybody (aside from the hosting cost itself)?
Wikipedia is a massive repository of information. The more useless, irrelevant information is added to it, the harder it becomes to find relevant information, and to manage the repository as a whole. It's a pretty simple concept.
I genuine do not understand this argument. The internet as a whole has this problem since you can have literally millions of low quality SEO crap pages all targeting the same subject, but Wikipedia itself will only every have a single page for each person/subject, which strongly limits the negative impacts of flooding. I'm really trying to find examples of how this would occur. The best I can come up with is increasing disambiguation pages for people with similar names, which isn't a big deal.
One negative impact is the administrative burden of moderating those pages. There are disputes, there is false information, intentional misinformation etc that 'editors' need to remove. The positive of having Muhammad Lee have a page on Wikipedia is I think less than this negative.
We already have social media profiles for non-notable people's life and accomplishments. That should be enough.
Wikipedia is a massive repository of information. The more useless, irrelevant information is added to it, the harder it becomes to find relevant information, and to manage the repository as a whole. It's a pretty simple concept.