I am wondering about the third party Algorand indexer.
As far as I know, purestake is running Algorand indexers in its platform.
For example, besides of purestake, I found the blockdaemon: Ubiquity - Blockdaemon . Here I want to know if there are other possible 3rd party indexers other than these two?
Another question: from my understanding, everyone could build its own indexer. Is that correct?