The 'who was there first' game doesn't make sense because neither of them created this term. One is older, the other is a company worth over seven billion euros and one of the biggest marketplaces in Europe. I'd argue that it has wider brand recognition because of that, but ultimately it all comes down to your background. I'd expect the number of people in the US who heard about it in context of the game library to be larger than for Allegro.eu and at the same time smaller than the original meaning.