Subversion... I used to dream of Subversion. I had to use CVS.
But anyway - Subversion did something truly amazing. People had used CVS - which is itself based around RCS - for so long that it'd somehow become a fact of life that version control systems were too difficult to write.
Even BitKeeper was itself based on RCS. And of course BitMover forbid anyone using BitKeeper - paid or not - if they worked on any other version control system.
Once Subversion proved that version control systems were, in fact, things which ordinary mortals could write, then suddenly everyone was writing them.
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We strive for transparency and don't collect excess data.