Snarwin

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Alt+Backspace works in bash too, and should work in any other command-line program that reads input using readline.

Naturally they only get to charge for already-sold copies if you accept the new terms that include the charges. As for how it’s legal to include those charges in the new terms to begin with, I guess you’d have to ask a contract lawyer. Presumably Unity’s own lawyers are convinced they can get away with it, or they wouldn’t have done it.

Unity licenses are sold as a subscription. When the subscription runs out, you either have to renew it and accept the new terms, or lose the license and stop distributing your game.

This technique is called Huffman coding, and it’s used in a number of compression algorithms.