Hey @dikbut101, welcome to the Community.
Hope you're doing great!
I'd would not recommend using a ad blocker for Spotify and there's no way of removing that box.
Spotify tries hard to bring music to everyone, and most importantly is free. To keep it free, users either join Premium by getting plenty of great features or watch ads.
By doing so, you're only damaging Spotify.
Hope it makes sense 🙂
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Note: I'm not a Spotify employee.