If we accept the Ireland situation as a legal fiction, then the EU would see no revenue here anyway, so I don't see the EU as actually being cheated out of anyt

If we accept the Ireland situation as a legal fiction, then the EU would see no revenue here anyway, so I don't see the EU as actually being cheated out of anything. EU firms domiciling in Ireland could reasonably be interpreted as hurting other EU members, but that's not really the case here. This largely looks like an EU tariff on whatever they end up defining digital companies as, which will likely be defined in such a way to tax Google and Facebook, while avoiding taxing Spotify.