Mazaahir Of Ibadah, Prescribed By God And Those Done By People
The postures God has prescribed for his worship are few and well known, these are the mazaahir e ibadat like, nazam, qiyaam, sajda, ruku, dua, tawwaaf, sacrfice of animals, fast, zakat, nazr. These cannot be performed for others to please them, as God has forbidden to worship any one else, and these demonstrations are the ways to worship others. The other examples you mentioned are not about mazaahir, these are about involving something unethical or immoral which make them prohibited.