[rihegher]

to answer to question 2: I guess they could limit hash rate result by IP address.

[TeMPOraL]

I think GP is talking about the case in which people kill off the mining script, so that it doesn't mine, after the side loads. I.e. ad-block for sneaky cryptocoin miners.

[rihegher]

Indeed I did not understand it in that way, It took so long for adblock to be a thing that I think it is a non issue for now.