Zdad:
That is ridiculous. The first case is not a mamzer at all, because there is a chazaka that rov beilos achar ha’baal. Rav Moshe paskened that reform and conservative weddings are not marriages.
You’re just pulling cases that you don’t understand because you haven’t learned enough, and using them as evidence that there are no rules. There are rules; you just need to know them.