Lack of evidence is the main reason those cases have failed. Lots of claims, no evidence.

https://www.bbc.co.uk/news/55561877

https://en.m.wikipedia.org/wiki/Post-election_lawsuits_relat...

>Nearly all the suits were dismissed or dropped due to lack of evidence;[6] judges, lawyers, and other observers described the suits as "frivolous"[7] and "without merit".[8]