The yellow and black flag is the ancap (anarcho-capitalist) flag. The rattlesnake is a libertarian icon and says "don't step on me". Bitcoin was built out of a libertarian idea that the government was to blame for the 2008 GFC because they somehow regulated the banks too much, so a decentralized digital currency was the best way to get around that regulation. ETA: the black and white US flag with the blue stripe is the "thin blue line" flag, flown by supporters of the police, typically a symbol used by the right wing of America. The three interlocking triangles form the valknut, a symbol used by ancient Germanic people's, and currently used by people who identify with Germany and the Vikings; white supremacists make up a large group who fit this description.

The red and black flag is an anarchist flag, a combination of two older anarchist flags: the black flag and the red flag. The ancap flag is descended from this one, replacing the red with gold (because gold is a very old and widely used form of currency, and money good, government bad). The purple and black one is the anarcha-feminst flag, and they also use the pink and black flag, but it's primarily seen as the queer anarchist flag. I'm sure I don't need to explain the LGBT+ flag. All Cops Are Bastards (ACAB) is a popular slogan amongst anarchists because cops are the strong arm of the state, and as such Black Lives Matter is a movement that a lot of anarchists strongly identify with and support.