> I guess at some point Google will close the F-Droid loophole in Android and only allow installations through the Playstore anymore.
Google standing in Europe is already really shaky. They keep taking fines after fines for abuse of their dominant position. That won't last forever. If they close the ability for other stores to exist, the best case scenario is the EU giving them a huge fine and forcing them to go back. Worst case is being force to split Android out of the main company. Google knows that which is why they will not do it.
Google is already split in EU, there are subsidiaries in various countries. Although parent company is in US. EU has no power to split US company, but can apply fines to localy registers subsidiaries when laws are breached.
Google standing in Europe is already really shaky. They keep taking fines after fines for abuse of their dominant position. That won't last forever. If they close the ability for other stores to exist, the best case scenario is the EU giving them a huge fine and forcing them to go back. Worst case is being force to split Android out of the main company. Google knows that which is why they will not do it.