This is not a hypothetical. It is, with minor variations, a fairly common story.
The alternative is to treat market entry as a hypothesis — one that deserves testing before it receives full funding. Portugal is, for this purpose, genuinely useful. It is a real EU market, not a rehearsal room. Customers here have credit cards, opinions, and the capacity to tell you — through their behavior, if not their words — whether your product makes sense in Europe.
The difference is that the cost of finding this out in Portugal is materially lower than finding it out in
Germany. And the cost of being wrong is recoverable.
We call this the pilot approach. It is not a consolation prize for businesses that can't afford to launch in London. It is a deliberate methodology used by founders who would prefer to arrive in the larger markets with evidence rather than enthusiasm.