These are just some of the more well-known providers. There are many others operating in this space, and new ones pop up regularly. The market is large and growing.
平台体量太小，意味着开发者的投入与收益严重失衡。做一个版本要付出完整的设计、适配和维护成本，却只能换来极少的用户基数。盈利模型也始终模糊，对商业团队来说，这几乎是一笔注定亏本的买卖。于是大厂的态度逐渐变成了「象征性支持」。
。体育直播对此有专业解读
Since Mongo is schemaless, there is no need to specify schema, only collections must be created. Same for indexes - these are just classic (B-tree) indexes that work on any field type.
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