Because you're paying a huge price for a small amount of convenience: you are trusting a third party so you don't have to deal with a lightweight server and a few gigabytes of data.
It's not like they are providing access to the Twitter firehose or the Google Search Index, which you couldn't have otherwise.
Edit: people are really downvote-happy on HN lately. You should not put a reasonable comment in the negative just because you disagree.
> Because you're paying a huge price for a small amount of convenience: you are trusting a third party so you don't have to deal with a lightweight server and a few gigabytes of data.
Can you point me to a ready-to-use address indexer for the blockchain, that can run on a lightweight server and only consumes a few gigabytes of data?
Well for me I can try some ideas without going all-in to setting up a bitcoind server. blockchain.info seems to have a half-hearted attempt at an API too.
