Despite Trump’s intense hunt for voter fraud, officials in key states have so far identified just a small number of possible cases - The Washington Post

... Most of those so far charged with illegally voting in the presidential race sought to cast one or two additional ballots and appear to have been driven less by a desire to actually swing the election than to cut corners on behalf of a friend or relative or, even, merely to test the system — an illegal act that had been encouraged before Election Day by Trump himself...
https://www.washingtonpost.com/politics/voter-fraud-investigations-2020/2020/12/22/bdbe541c-42de-11eb-b0e4-0f182923a025_story.html