would not be surprised if regional pricing is pretty much just above the break even mark
And in the efficient market, that's how much the service would cost for everyone, because otherwise I could just go to a competitor of YouTube for less, and YouTube would have to lower their pricing to get customers, and so on until no one can lose their prices without losing money.
Unfortunately, efficient markets are just a neoliberal fantasy. In real life, there are network effects - YouTube has people uploading videos to it because it has the most viewers, and it has the most viewers because it has the most videos. It's practically impossible for anyone to compete with them effectively because of this, and this is why they can put their prices in some regions up to get more profit. The proper solution is for regulators to step in and require things like data portability (e.g. requiring monopolists to publish videos they receive over open standards like ActivityPub), but regulatory capture makes that unlikely. In a just world, this would happen and their pricing would be close to the costs of running the platform.
So the people paying higher regional prices are paying money in a just world they shouldn't have to pay, while those using VPNs to pay less are paying an amount closer to what it should be in a just world. That makes the VPN users people mitigating Google's abuse, not abusers.
A business being in a position to be able to implement differential pricing (at least beyond how they divide up their fixed costs) is a sign that something is unfair. The unfairness is not how they implement differential pricing, but that they can do it at all and still have customers.
YouTube can implement differential pricing because there is a power imbalance between them and consumers - if the consumers want access to a lot of content provided by people other than YouTube through YouTube, YouTube is in a position to say 'take it or leave it' about their prices, and consumers do not have another reasonable choice.
The reason they have this imbalance of market power and can implement differential pricing is because there are significant barriers to entry to compete with YouTube, preventing the emergence of a field of competitors. If anyone on the Internet could easily spin up a clone of YouTube, and charge lower prices for the equivalent service, competitors would pop up and undercut YouTube on pricing.
The biggest barrier is network effects - YouTube has the most users because they have the most content. They have the most content because people only upload it to them because they have the most users. So this becomes a cycle that helps YouTube and hinders competitors.
This is a classic case where regulators should step in. Imagine if large video providers were required to federated uploaded content on ActivityPub, and anyone could set up their own YouTube competitor with all the content. The price of the cheapest YouTube clones (which would have all the same content as YouTube) would quickly drop, and no one would have a reason to use YouTube.