Your own site stays the master source even once the work is syndicated everywhere else.

Their wordsMy own site is the master source of everything I make. But now it's also shared everywhere, so we can meet in your city instead of my little town.

Their wordsWith this model, even when a platform goes under, you lose relatively little: your posts still remain live and under your control on your site, even if the copies of them on the disconnected website are abandoned or deleted.