Matrix is a federated alternative to Discord that is both open source and highly concerned with user privacy. It’s also very popular here on Lemmy, and a lot of communities here use it. 
Trump’s lawyers, and especially Trump, called his own 2016 election win “rigged”. He WON and still called it rigged. That’s how full of shit the guy is and proof that he’ll call anything rigged, biased, or whatever in order to look like a victim.
get started here by choosing a matrix client: https://matrix.org/ecosystem/clients/