If the olives in the salad don't taste as good or there are fewer breadsticks or the lighting makes it feel more relaxed or the greeters have more time or the menu gets shorter or the desserts arrive quicker or the pasta is less salty, that's because someone involved in that decision decided it was worth paying more for or not worth paying what they were currently paying, taking into account what factors will make people change their mind about eating there. There isn't just a random dude who sits in a room somewhere and says "let's make the food worse" based on his own whim.
If the food gets worse and it just doesn't have that same vibe anymore and you don't want to go there next time, it's because an expert in marketing or restaurant management or food design made an error in their judgement about what they could cut, what they should improve, and what they needed to keep the same. That, or the change which turned you off attracted more customers or more desirable customers who have different preferences to you.
Your restaurant changed because its corporate policy changed. But the capital structure is totally relevant in understanding why that changed.