We need our own node for transaction checking purposes, fore block explorer API has their limits on number of request after which their block ip from which the requests are made...
Blockchain.com have a form if you want to bypass their "
limiters":
https://www.blockchain.com/api click "
REQUEST API KEY".
That involves registration and providing them some information.
And i thought to my self if you set up your own node you will be limited only to a speed of CPU and internet speed of the machine on which node is set up...Dedicated server definitely.
Internet speed will only be an issue during the sync process.
For fetching blockchain data which requires
-txindex, you'll be needing fast drive, powerful processor and a quite huge RAM for huge cache size
since you're talking about a scale beyond the limit of most blockexplorer API.