Users have learned to ignore content that resembles ads, is close to ads, or appears in locations traditionally dedicated to ads.
The more buttons there are, the longer it takes them to make a decision. They have to examine each button to determine which one best meets their goal. Any uncertainty or doubt about the buttons could cause them to take no action or the wrong action.
You can prevent this by making the priority of each action intuitive. When users can see which button is important to their task, they’re able to take action right away. There are a few UX techniques you can use to make a big difference on the intuitiveness of your call to action buttons.