Google - Is unlimited photos/vids with Pixel retroactive?

... If I get a Pixel, that includes unlimited cloud pics and video.. is that retroactive to my existing pics and videos? They now magically take up

... If I get a Pixel, that includes unlimited cloud pics and video.. is that retroactive to my existing pics and videos? They now magically take up no space anymore? Or if I store pics not taken with the Pixel?

or:... If I get a Pixel, that includes unlimited cloud pics and video.. is that retroactive to my existing pics and videos? They now magically take up no space anymore? Or if I store pics not taken with the Pixel?

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