Strange to see so many people voting that there is good evidence of fraud when Trump's legal teams aren't even arguing fraud when they get in court. If there was any evidence you'd think that they would actually use that in court instead of just trying some weak legal technicality plays. If they argued fraud backed by evidence (which they've publicly claimed that they have) and got shut down they could at the very least try to claim being mistreated by the court and appeal.
I'd say that it's pretty suspicious that they are consistently throwing fraud accusations around in general media but as soon as they get to court, when they are speaking to professionals and can get into trouble for lying, they completely change their tune.