In those days there was no such thing as copyright protection, so, though Yao's songs were continually sung and recorded, he did not become wealthy as a result of the popularity of his music. On the contrary, his life was as tragic as the songs he wrote.
在著作權還不被重視的年代，儘管姚讚福的曲子一再被傳唱，然而，姚讚福的一生，並未隨著歌曲的流暢而富貴，反而像歌曲的內容一般，悲苦潦倒，一生心酸酸。