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Q. Would it be legal?
Q. Is there a free way to get the same info?
They play upon the adwords/adsense arbitrage opportunity . In order to be successful they pay pennies and try to reap $$$'s . They have normally higher than normal Click thru rates ( on a/c of good copy etc ) and are placed high by the G algo ( A flaw?).
You will find many threads on this forum regarding the hated MFA , how to block, recommendations by experts/ seniors etc...