Equating Biden to Trump in any way is next level bullshit. Biden as a choice is meh leaning towards yucky. Trump as a choice is a stage four bone cancer, broken glass in rectum, testicular torsion, kidney stone mega combo.
This is not entirely true. There are states that outlaw other parties on their ballots. Do not underestimate the powers that thwart any semblance of democracy.
Last time I looked, third parties made the major parties look good. None of the candidates seem like people who I want running the country, but major parties can, at least, publish a consistent plan for what they want to accomplish.