While JSON-LD is part of the ActivityPub specification, Lemmy doesnt use it at all (and afaik neither do Mastodon, Pixelfed, Peertube etc). Instead Lemmy uses JSON and Piefed is probably the same. We do provide the JSON-LD definitions which that comment complains about, but they have also often been incomplete.
Honestly I dont even know which Fediverse software uses JSON-LD. It doesnt seem useful to know “there is something called an Accept activity” when you dont have the UI logic to display them.







I just commented here on that thread, its really not a big deal. Using regex for string matching also sounds fine. On the other hand Piefed is a smaller project than Lemmy, so it has less testing and reliability. In the end it depends on your own requirements whether Piefed or Lemmy is better.