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I argue that feedback is as important to formation of planets as it is toformation of stars and galaxies. Energy released by massive solid cores puffsup pre-collapse gas giant planets, making them vulnerable to tidal disruptionsby their host stars. I find that feedback is the ultimate reason for some ofthe most robust properties of the observed exoplanet populations: the rarity ofgas giants at all separations from $\sim 0.1$ to $\sim 100$~AU, the abundanceof $\sim 10 M_\oplus$ cores but dearth of planets more massive than $\sim 20M_\oplus$. Feedback effects can also explain (i) rapid assembly of massivecores at large separations as needed for Uranus, Neptune and the suspected HLTau planets; (ii) the small core in Jupiter yet large cores in Uranus andNeptune; (iii) the existence of rare "metal monster" planets such as CoRoT-20b,a gas giant made of heavy elements by up to $\sim 50$\%.

Tidal Downsizing Model. IV. Destructive feedback in planets