Commentary When GoFundMe shut down funding Friday for the truckers’ Freedom Convoy, it didn’t just clobber Canadian rig drivers; it dealt a blow to the rights of Americans. Silicon Valley executives are trying to limit the causes Americans support, favoring leftists and canceling conservatives. We Americans have a constitutionally protected right to donate money to whatever causes we choose, the Supreme Court ruled in Buckley v. Valeo. Money funds political activity, and limiting where we can donate is like gagging our speech. Canadian truckers launched a convoy to Ottawa last month to protest Prime Minister Justin Trudeau’s vaccine mandate on all rig drivers. Never mind the absurdity of requiring a truck driver alone behind the wheel for 18 hours a day to be vaccinated. The convoy set up a fundraising site on GoFundMe to pay for fuel, food, and lodging. Many Americans rushed to support it. It had reached $10 …