I‘m not disagreeing with what you’re trying to convey but still: Mussolini very likely never said/wrote that, seems to have been misattributed. IF he did, the Italian word corporazioni, while technically translating to corporations, doesn’t refer to private companies, which in Italian are normally called società.

More info:

• Mussolini on the Corporate State
• Wikiquote - Benito Mussolini

Is there a reason to keep this structure other than „we’ve always been doing it like that“/backwards compatibility?

The GDPR is a regulation (that’s what the R stands for), not a directive. Directives must be transposed into national law by the member states, while regulations apply directly