The graph is not always increasing. Is there any metric which can give us a measure as the proxy for the number of Users in any network?
I thought unique address used so far can be a measure, but that metric is not available on blockchain.info
I would not advise using blockchain.info as a purse. Maximum, you can use its currency converter and monitor transactions on the bitcoin network. To store your funds, use Electrum, Trezor, Ledger or BitcoinCore.