I've been working with European companies for a decade, language is not a barrier for scaling, local laws are.
E.g. why eu has some laws in terms of data and privacy, local laws take precedence (unlike in e.g. agriculture that it's entirely EU's business). Scaling across borders is expensive and difficult for regulatory reasons.
To be fair the US is not immune to that issue either, some states (looking at you CA) are very fond of making random extra state laws that don't exist at the federal level and affect commerce