You're confusing anonymity with privacy. Your identity can be temporarily unknown while your transactions are visible (which makes them unique and weakens your anonymity over time) Just because I'm not interested and/or able to do it doesn't mean more nefarious actors like governments, criminals, and chain analysis aren't interested and able. It's not random, it's probabilistic, and only a few major pools have most of the hashrate so get most blocks. They can do it for any reason or be pressured by government to make white lists, exclude your transactions because they saw you go into or out of a coinjoin, because you sent or received money from an address or transaction type they don't like. Knots miners already censor transactions without government involvment. That doesn't mean it will necessarily be stopped, maybe it would eventually get through if a black market miner got a block every once in awhile, but would undoutedly place a massive burden in time and fees for you to get it through. Would only make economic sense for you to send if it was a very large transaction. If it was private they would have to censor all transactions to stop yours which would be far less realistic because of the massive fee pressure that would be placed on miners from all those transctions.