It is already bad, that we need jurisdiction for such things in the web. I think we actually need such things to happen more often, so ppl can finally vote with their fest a long time ago for some freedom against a tiny bit of convenience. I think what we lack is a decent amount of social pressure.
What we need is the largest tech companies broken into smaller pieces.
The de facto monopoly of most of these players exists in their cross-border market share, making enforcement under traditional antitrust law in any one country difficult.
Unfortunately, it's also something of an international zero sum game due to efficiences of scale -- if the US breaks up Amazon, Alibaba gains world market share, and we're back in the same place.
The most effective remedy I can think of offhand is government involvement in a special, independent branch of the company, dedicated to increasing interoperability and exposing services, empowered by legislation.
If we're going to have monopolies, at least they can be open ones. E.g. 18F + Google Takeout, backed up by regulation