The person you are replying to is talking about pink sky being built on bluesky, and you equate that to Lemmy being based on Reddit. One is a hard technical dependency, and the other is a conceptual inspiration.

You are engaging in an equivocation fallacy, and I think you know that. You even try to sneak it in by switching to a different but similar word (built->based) with a different meaning, then you switched back again to “built” while using the term in the same way you used “based”, then you start using other phrasing to obscure it even more. You are gaslighting with word games to try and get people to not notice your fallacy. It’s super dishonest.