This could be seen another way. Instead of going too far with its contracts, i.e. limiting the supplier side, the results of these regulations should entice future companies to not go too far on their distribution, i.e. limiting the demand side.

If it becomes clear that having a dominant position in a market can be problematic, a reasonable company might do things to prevent it from happening including limiting growth, raising prices, stymying third-party ecosystems/distributions, and reducing feature investment. It can be argued that these punishments are predictable and easily avoided with self regulation, we just need to be sure we're happy with the forms this self regulation may take. Being in a dominant position is rare for sure, but in these rare cases, if I had a choice, I'd do everything I can do be just under dominant.

Google might want to start realizing this with Chrome and surreptitiously support (...er...keep supporting) Firefox or not implement too many features before others can catch up.