I have quite a few. I don't believe in copyright laws or IP in general. I think it holds back innovation and exists solely to benefit megacorps like Disney or pharmaceutical companies.
For example - you develop a new drug that really helps some people. You charge $50 a pill even though it costs you $5 to produce. Without the government protecting IP, another company will come around and produce it and sell it for $6 a pill, providing cheaper access to healthcare.
People will say "what would give someone the incentive to make new things?" Without actually thinking it through. For a great example of how lack of IP is a good thing, look at how Shenzhen went from a fishing village to a Chinese San Francisco in a few short decades.. one company will take the product of another and iterate on top of it.
Another unpopular opinion is I'm pretty absolutist with free speech. I think certain things like calls to violence or intentional defamation of character should be restricted. But pretty much everything else should be fair game.
I believe in open borders and think the US should return to the late 1800s style of immigration. We're gonna need the population to compete with China in the coming century.
I also think that the primary investment into climate change at this point should be preparing for the inevitable changes instead of trying to prevent the inevitable.