It's a massive losing battle for them, yes of course they can't get people if they don't advertise so how do they knoow if they don't try. However their competition is entrenched for 20+ years, it looks like for most generations NA+UK is about 75% of total Xbox sales by a very quick guesstimation meaning very little spread over remaining markets. Then with the Xbox One launch they shot themselves in the foot and soured a lot of people's opinions because it wasn't marketed at them, it was the US focused TV TV TV box.
It's a lost battle if you don't turn up to fight. As for having an entrenched competitor, this was Sony's situation when entering the market in the 1990s where Nintendo and SEGA had been entrenched for 20 years. Sony arrived on the scene, with zero videogame credentials and began a media and advertising blitzkrieg for PlayStation and they just kept that going for five console generations.
There are people growing up who will be gamers in the future and most of them in Europe will know PlayStation because they'll have been surrounded by PlayStation marketing for years.
Do you choose to spend potentially billions on advertising, hardware shipments etc over 10+ years and very possibly get very little back for it?
Because advertising is proven to work. It is not a coincidence that companies behind the most successful brands are also those that advertise the most. Do you think Coca-Cola advertise because they think people do not know what cola is? It's because they want consumers who are thirsty and want a drink to think about buying a Coke before anything else.
Microsoft have brand recognition but most people will associate it with Windows and Office because that this software is endemic.
Do they have GamePass in Europe?
It's a mixed bag. Some countries have all GamePass options, but quite a lot have limited GamePass options, e.g Cyprus, Romania, and Ukraine only have basic PC GamePass. You can use the region drop-down on
this Xbox support page to see what games services are offered in which regions. I am quite surprised Russia is showing as full services given most tech companies (Apple, Google, Nintendo, Sony, Valve)
pulled out to comply with US sanctions on goods and services.