You're safe, I think.

The comment (asking the question) did incur a fee to SN for 1 sat, but your reply (answer) came at no additional cost to the asker.  So I don't think a lawsuit would win.

Did it? I didn't know, please don't sue me.

fiatjaf

247bf84fda

I will answer questions for free with no cost for the price of zero and we don't require you to provide a credit card upfront.

Didn't this cost me 1 sat to get you to answer this question?  So, technically, not "free"?

nostr

I'm fiatjaf of nostr, lnurl, and zebedee, AMA

> I will answer questions for free with no cost for the price of zero and we don't require you to provide a credit card upfront.

https://twitter.com/fiatjaf/status/1498713671027113989

Didn't this cost me 1 sat to get you to answer this question?  So, technically, not "free"?