I haven't used Artifact, but my understanding is it uses "AI" to personalize the feed of content and the sources of content it aggregates are based on an allow list of publishers.

LinkLonk differs in these two aspects:

1. The algorithm is intentionally simple - like content to get more from that publisher (ie, RSS feeds) and from other users that liked it. Dislike - to get less. There is no AI so that you as a user could have control. For example, LinkLonk does not use your view history to guess what else you would like.

2. The list of sources is any RSS feed users have added. LinkLonk also automatically tracks any feed that posted content users liked. In this respect LinkLonk is more similar to RSS readers.