However all organisations must be able to handle GDPR requests via any communication channel. Eg. They need to treat a data deletion request sent via twitter DM as a valid request if they have an official Twitter presence.
It is insufficient to require the customer fill out a special web form.
> The GDPR applies to: [...] > 2. a company established outside the EU and is offering goods/services (paid or for free) or is monitoring the behaviour of individuals in the EU.
Assuming account names or the content of comments constitute personal data within GDPR, I think YCombinator falls into this group.
Edit: I forgot HN collects an optional email address too, which is definitely personal data.
Details here: https://www.ycombinator.com/legal/#:~:text=Hacker%20News%20I...
GDPR allows individuals to request erasure verbally or in writing, and the data controller than has one month to respond.