It is true that these days people have much more choice in entertainment, the spread of computers and video games is just one example.

spread 是动词 spread 的过去分词形式，在这里作名词使用。spread 作为动词时意思是"传播、扩散"，作为名词时指"传播、蔓延"的过程或现象。这里指电脑和视频游戏在人群中的普及和流行趋势。