Bitcoins are a fungible commodity and as such any 1 bitcoin or portion of a bitcoin is functionally equivalent to any other. People who are concerned that their transactions might be tracked have been known to use "mixers" or "shared send transactions" to make it more difficult to track where the bitcoins "came from" or where they "went to". It is difficult to know if any particular service is actually doing a good job of hiding activity, and entirely possible that some services are being run by government agencies so that they can secretly maintain a database of the source and destination of each "mixed" quantity.
see this is what I always thought.
Sometimes I see posts that differ and act like "clean coins" will be worth so much more
but who really cares?