Regulation is the first door, not a footnote
In Denmark the category's boundary is drawn by the regulator, not the marketer: caffeine is capped at 32 mg per 100 ml, and anything stronger cannot be sold without review. The live risk isn't demand — it's a youth sales ban. Norway already bans sales to those under 16, and Denmark is openly weighing the same. One law would reshape the core cohort overnight.
The boundary of this market is a law, not a marketing choice.
So, for an entrant → Build sugar-free and cap-compliant from day one, and price in a youth-access restriction before it lands.