The one thing that I don't like about /e/ and similar services is that they ask you to leave your current walled garden, but it's not 100% (at least, not from their website) whether their solution allows you to actually own and manage your data, as in self-hosting as many services as you can and/or change service providers (the very same way you could move your phone number from one provider to another or change ISP for home connectivity or go to a different store for groceries if you want to).