[hartator]

And just before, they will try to inject ads in the blockchain.

[hanniabu]

"You must watch this ad to recieve your block reward or send a transaction"

[smitty1110]

And do three captchas to view your wallet.

[Nextgrid]

"Mining" this Google blockchain would be offices full of people solving captchas all day long.

[throw_nbvc1234]

Nah, they'll make a hybrid of captcha and ads so that they can get companies to pay them for the captcha content.