HelloFresh made an honest mistake. It's the sort of mistake that anyone could have made. They had poor understanding of some fairly complex legislation and wrote an insufficiently clear opt-in statement. This led to some people who had consented to receive promotional e-mails instead receiving text messages, or emails of a type that they didn't expect based on the opt-in.

The regulator is fully satisfied that HelloFresh made an honest mistake, they're satisfied that they've taken adequate steps to fix the underlying problem, but the fine essentially says "you made a fairly minor mistake, but you're a big company and we expect better".

What you're proposing is an arbitrary and disproportionate punishment pour encourager les autres. It's the corporate equivalent of sending people to the gulags for littering. It doesn't work, it's hugely costly and it is (rightly) illegal in any country governed by the rule of law. You can't make people infallible through fear.