It's convenient to think this is some simple tax loophole that needs closing, but that's unlikely. Those 50 legal entities likely have no profit (on paper) due to fairly arbitrary pricing of intellectual property and the loans. It'd be interesting to see where the profit ends up disappearing into - if anywhere at all, because Uber isn't profitable IIRC, and it's profits that are taxed in major jurisdictions (IIRC, IANAL, I bet there are thousands of exceptions).
The real problem here isn't the dutch sandwich, it's the very notion of taxing profits. We should not tax profits nor capital gains; we should tax revenue and ownership - those are much harder to game. After all, that's what we do with individuals too.
Such taxes are, in principle, not new: VAT is such tax. When implemented properly, those taxes have the additional benefit that they encourage participation - after all, you get to deduct VAT already payed on your inputs when paying VAT on your outputs.
This is a much more resilient model, and thus a better basis for for corporate taxation; and it's open to tweaks (e.g. discouraging hyper-complex legal structures by allowing less than 100% deduction for input VAT); it's potentially regressive, but if you acknowledge that, you can attempt to compensate for that by altering (or even dramatically reducing) income tax, and considering measures such as universal basic income, and choosing to have lower tax on human consumables (food) than on e.g. services (vacations or medical care).
Fundamentally though, the real problem here is that profit is a mirage; it's much too easily distorted, especially with flexibly interpreted valuations of ever more intangible goods we have today. Transactions however, are at least a little harder to fake, so those should be where taxation takes place if possible.
Another advantage of VAT is that it can be levied by a consuming country; the US could simply impose this, and mostly ignore whatever shenanigans in corporations try to pull in foreign jurisdictions.
Which isn't to say VAT doesn't have it's issues (e.g. https://en.wikipedia.org/wiki/Missing_trader_fraud ) - but by and large those are much more easily dealt with, and easier to clearly label as fraud, not merely clever and antisocial but legal tax avoidance. And perhaps somebody can come up with something even better than VAT; but regardless - I'm pretty sure playing whack-a-mole with profit-shifting tax avoidance isn't going to lead anywhere very quickly.