If you have rules questions about this card, you are not alone. To answer your question, this card should be officially errata'd to read: "As an additional cost to steal Obokata Protocol, the Runner must trash 4 cards from his or her grip at random." All of the rulings support this errata.

2

In that case it would stop IHW from triggering from it, so not exactly

Plus stuff like Chronos Protocol, PU, and Net Shield.

This makes no sense

Net Damage doesn't equal Meat Damage, and neither are the same as trashing from hand.