Edit: A lot of people here are saying "I do not pay for it so it is free". Just because you don't pay does not mean it is free for everyone. The law just states that fees must be the same for domestic and EU transfers, not that the transfer is free and, there are countless examples of regions where there are no banks that charge nothing (especially regions where a lot of intra-EU immigrants come from).
If your bank is charging differently for transfers to euro denominated accounts in other countries, complain to the regulator. This isn't allowed.
B) The "target" bank can still charge you independently of your bank.
E.g. (and I do this kind of transfer very very often so I am 100% sure it is so and I am also 100% sure this is legal): A transfer from Germany to Germany is free. A transfer from Germany to Greece is not as the Greek bank charges a fee.
Plenty of people regularly do cross-border SEPA transfers for free. I do, and I'm not even in the EU/Eurozone.
What stops you from doing day-to-day banking in Greece using a German account? That's kinda the whole point of the Euro.
Besides that, this is not the point of the conversation. The original comment compared SEPA to Bitcoin, saying that SEPA is better since it is free. It is not. There is no law that mandates it to be free and it is de facto not free everywhere (it might be for your use case but not for everyone). It is many times a lot more expensive than Bitcoin. If I also elect to not transact with Greek bank accounts, I exclude 99.9% of the Greek economy since I have no influence on what kind of account my counterpart has.
Of course you are! Have you never heard of N26? And even some traditional banks will happily have you as a non-resident customer.
Deutsche Bank is well known for offering accounts to non-residents. Pretty much any Sparkasse will open an account for you if you walk in even without a German address.
The list of banks that don't offer accounts to non-residents is probably shorter than the other. Granted, these are mostly the ones with the best offers.