But how can you be sure that they will be used “properly”. Sure, you can claim that you’re using it properly. But your definition of using it properly may not be the same as the IP owner’s definition of what it means to have their brand image used properly.
Uncontrolled or unlicensed exposure is always bad, even if it’s a positive exposure, because the IP holder cannot be certain on what would happen if things go in ways that they don’t anticipate it. Licensing is important, whether you like it or not. Even if they can limit the use of livery to live AI traffic only, that’s still needs permission from the IP holder to be able to use their brand image for that purpose.
This means, Microsoft may need to send them the codes for how the AI traffic behaves, what would happen if certain things happen, and they need to absolutely convince the IP holders that their brand image will be used appropriately, and they could also give them a set of demands themselves. That they would only allow Microsoft to use their image if they have their AI traffic to do certain things, etc etc. They may even have a specific clause saying that they only approve to have their liveries to work for the Asobo’s default AI traffic. If you install any community mod that changes or replaces these behaviour, it’s well within their rights to have their livery disabled until you remove that mod.
There’s a lot of negotiations and agreements between both parties that needs to be made in order for their actual liveries to be officially licensed to Microsoft for its use. Saying “Dude, Trust me” is not a valid process for a legally binding agreement to ensure that your brand will not be misused in anyway.
Then that payware would already have their airline liveries licensed from whichever airlines it has.