Teams is based on the "equal access for members" principle, you should probably look at a different solution given your requirements (custom SPO site for example).
You can edit the underlying SharePoint document library and change the members group to View only, you need to do that in the advanced permission options in the document library.
You can edit the underlying SharePoint document library and change the members group to View only, you need to do that in the advanced permission options in the document library.
