Yeah, booting from USB is something you see a lot in the data security and/or privacy-oriented circles. Because many USB boot drives are designed to be volatile, meaning nothing about the OS is actually stored on the drive. So you can nuke the whole OS just by unplugging the drive.
Basically every (smart) drug dealer who orders their supplies on Tor uses a USB drive OS, so if the cops ever bust down their door they can just yank the USB and destroy all evidence of their online orders.
But it can also be useful for test-driving a particular repo. If you ever manage to fuck things up royally, you’re just one reboot away from a fresh start.
Tankie is a sort of derogatory term for people who whitewash and cover up the horrors of communism.
There was a rebellion in the Soviet Union. The SU responded by rolling tanks into town and violently busting it. This put two sides of communism at odds; On one hand, there was the plight of the working class (the rebellion) and then on the other there were the actions of the people in control (the tanks). Tankies are the “communism has only ever helped people, you’re just listening to capitalist propaganda” folks who decided to side with the tanks, instead of siding with the working class. It’s sort of like calling someone a fake communist, [insert “No True Scotsman fallacy” argument from a tankie below], because a “real” communist would side with the working class.
You see it a lot on Lemmy because many instances have some major communist lean. After all, the “anyone can run their own instance and be in charge. No centralized instances, if you don’t like the mods you can just change instances” concept of the Fediverse jives very well with communist ideals. For instance, the “ml” in lemmy.ml is meant to stand for “Maoist/Leninist”. And that means the entire communist spectrum is on display; From both the more moderate “yeah communism has some cool parts but was also responsible for some major humanitarian crises” to the more extreme “those crises [were caused by individuals, not by the political system]/[never actually happened at all. They’re lies made up by capitalists to deter people from supporting communism!] Communism never actually hurt anyone.”