The ones who profit the most from more regulations are usually the big existing players (in the case of general regulations). He has a lot of investments in big

The ones who profit the most from more regulations are usually the big existing players (in the case of general regulations). He has a lot of investments in big players, so the motive would be good old monetary gain. In the case of more specialized regulations targeting single players can be used to take out the competition (e.g. hurting Google might be good for his stake in Facebook).