I disagree with your assessment of their quality. As someone that used to spend a majority of the year traveling in the pre-COVID world, OTG takeovers have only improved the quality of food and drinks that are available in the airports they have won contracts in. Yes, they have some establishments that aren’t great, but I still prefer their attempt to be somewhat more appealing than Subway/Burger King/Dunkin Donuts/whatever other garbage tier food option used to be in the same spot OTG took over.
Their prices are stupidly expensive, but for business travelers with expense accounts…it doesn’t matter.