Reply:

> Yes, sorry, but you can't post those comments to Hacker News. They're simply off topic. 
>
> It's also not in your interest to do so, in my experience; I don't think the community will react well to such posts. For one thing, there's way too much cynicism around cryptocurrency stuff now; for another, they will be interpreted as an ad for your site, which will lead people to use unkind words like 'spam'.

Yes, could very well be it. I just sent an email:

> To: hn@ycombinator.com
> Subject: Dead comments from stackernews
> 
> Hi Hacker News,
>
> I am the creator behind the recently created "stackernews" account. [0]
I am fetching top stories from HN and posting them on https://stacker.news/, a site which is very similar to Hacker News but where upvotes are satoshis.
For example, see this post: https://stacker.news/items/164952
>
> I wanted to provide the OP from HN the option to claim these sats. So I thought I would post a comment like this:
>
> > Your post received 1148 sats and 11 comments on https://stacker.news [0].
> To claim your sats, reply to this comment with a LN address or invoice [1].
> You can create a SN account to obtain a LN address.
> [0] https://stacker.news/items/164952/r/hn (referral link)
> [1] https://docs.lightning.engineering/the-lightning-network/pay...
>
> -- https://news.ycombinator.com/item?id=35595557
>
> However, I have noticed that these comments show up as [dead] in incognito so I think they are getting shadowbanned.
Is there something in that comment which is not allowed? If so, I would be very happy to remove it to make the comments show up.
>
> I have no ill intentions with these comments. I only want to provide the OPs the chance to claim these sats (if they want).
>
> [0] https://news.ycombinator.com/user?id=stackernews
[1] https://stacker.news/hn
>
> Looking forward to hearing from you.
>
> Best Regards
> XXXXXXXXXXX

Most likely there was some kind of scam detection that got triggered. So many scam bots mentioning Bitcoin exist that they may have a filter for it.