In most if not all Crypto 2.0 systems, a Gateway can:
Charge the users for IOU deposits
Charge the users for IOU withdrawals
In Ripple, a Gateway can set a percentage fee for whenever their IOU is transferred from one user to another. Say, at 1% fee, to send someone $100, one needs to spend $101. The recipient receives $100, while the ...
From your question it sounds like you don't know what the difference between a smart contract and coin is.
First of all, smart contracts are ran by the Ethereum network. If you forked litecoin or bitcoin, it makes no sense on why you are talking about smart contracts.
Second, if you forked litecoin and created a new coin, you still need to mine it. This ...
It may work, depending on the currency.
You will likely be able to send BCH to a BTC paper wallet, and LTC to a BTC paper wallet with a 3-address, due to address format overlaps.
You will not be able to send currencies with other address formats, such as Ethereum, Monero, ZCash, etc.
Do note that even if you do succeed in sending the currency, there is ...
The Bitcoin network is fairly simple in terms of its core security, so technically there are three things these companies/projects can do to contribute:
Run and/or encourage development of the bitcoind codebase (including code reviews)
Run and/or encourage a higher number of solo miners
Run and/or encourage a higher number of full nodes
Point 3 is ...