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Because the AMP pages are often functionally crippled compared to the real site and require clicks to get off and on to the real web page (see Reddit, The Guard
by Mindwipe 5y ago
Because the AMP pages are often functionally crippled compared to the real site and require clicks to get off and on to the real web page (see Reddit, The Guardian etc), as well as the negatives of giving Google that level of control.