alt Hacker News> By uploading any User Content you hereby grant and will grant Y Combinator and its affiliated companies
The user content is supposed to be licensed only Y Combinator and (bleah) its affiliated companies (which are many, all the startups they fund, for example).
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If you carry on the quote two more words:
> ... a nonexclusive
I.e. this section is talking to additional rights to the content you post to ALSO go to YC, not that YC is guaranteeing it (+friends) will be the only one to hold these rights or will enforce who else should hold the rights to your publicly shared content for you.
There's a more intricate conversation to be had with GDPR and public data on forums in general but that's wholly unrelated to what YC's legal page says and still unlikely to end up in an alarming result.
That agreement is largely about "Personal Information", not the posts and comments.
That said, there are "no scraping" and "commercial use restricted" carve-outs for the content on HN. Which honestly is bullshit.
Curious why it should be on HackerNews to enforce restrictions on content they only license from you?
If it's owned by you and only licensed by HN shouldn't you be the one enforcing it?