Of those affidavits that were brought to court, many of them were tossed for being hearsay (someone swore that they heard someone else say that a third party did something), or called out standard vote counting practices as being suspicious, or were otherwise irrelevant. In many cases Trump's people went to court saying "We're not alleging fraud" and instead tried to get rules changed to throw out votes in blue areas. Evidence of actual fraud wasn't brought to court. Yes, there was some voter fraud; both Pennsylvania and Georgia found two voters each (yes, 2) who cast someone else's ballot (a deceased parent in some cases). But to flip an election you'd need thousands of people committing this kind of felony.