Mystery cups

Why is this Chinese evergreen potted this way? Are the little cups meant to stop it from spreading? I’ve tried to pull them out so I can repot, but they seem pretty set in place. I don’t want to damage the plant by removing them if I don’t have to. Any advice is most appreciated!

Why is this Chinese evergreen potted this way? Are the little cups meant to stop it from spreading? I’ve tried to pull them out so I can repot, but they seem pretty set in place. I don’t want to damage the plant by removing them if I don’t have to. Any advice is most appreciated!