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they've even got a competing service Google PageSpeed that does exactly what CF does

PageSpeed Service is in a limited field trial, and is not currently accepting new signups

Oh, I didn't know they closed signups. I've been using it for some personal projects for a good while (Since 2011 or so?) now.

it was never really open.

Yes, announced in 2011. Looks like it was launched with limited signups: http://googlewebmastercentral.blogspot.com/2011/07/page-spee...

If google still doesnt think it has a marketable product after 4 years.. maybe a cloudflare acquisition isn't too far fetched.