Wrong, wrong and wrong. The majority of Americans DO NOT believe there was mass voter fraud that would have ever changed the results in the 2020 election; it's the Republican base that does because Trump and his shills keep telling them there was.
For over a year, GOP allies repeatedly state there's more and more evidence coming out daily that substantiates their claims yet have repeatedly failed to produce such in any Court. In fact, nine Trump/GOP allied lawyers who've pushed those erroneous claims both publically and in Court have been legally sanctioned, lost their law licences and are facing disbarment, including Rudy Giuliani, Sidney Powell, Lin Wood, etc.
Giuliani and Powell are also currently facing multi BILLION dollar defamation lawsuits against them by both Dominion and Smartmatic. They'll lose if either case goes to court. Newsmax, OAN and Fox News too are also being sued for billions as well, including their chief propagandist hosts, eg. Maria Bartiroma and Lou Dobbs. They too will also lose in court as the evidence against them is already stacked high. I predict they'll all settle out of court before the Discovery phase.
With respect to how Biden won 81M votes, it's pretty damn easy to explain when you engage your mind and actually conduct some historical research as to past elections.
First off, population size is constantly expanding as too the number of eligible voters that can legally vote every four years. Secondly, 2020 had the highest % of voter participation in over 100 years (66.9%) with 159,690,457 of 257,605,088 eligible voters casting a vote. 2016, alternatively, had a turnout rate of 59.2% with only 136,669,276 of 230,931,921 eligible voters casting a vote. Thirdly, people were so desperate to get rid of Trump that not only did people who had never voted before in their entire life register to vote but even lifelong Republicans refused to vote for him, though they voted Republican down ballot for every other candidate.
In addition to all of that, Dems took Covid seriously from the very beginning and encouraged their supporters to vote by mail for health and safety reason. The GOP, alternatively, constantly downplayed Covid and encouraged their supporters to vote in person. That is how and why the red mirage (of a perceived Trump victory occurred) because in person ballots were counted first before any of the mail in ballots were counted.