I've searched for this ERC-825 and it turns out that this is a real thing and it's a project of bitclave.
You guys can read more about it here: https://medium.com/bitclave/do-not-pay-transaction-fees-in-ethereum-21a9dccaaf63
Their github discussions: https://github.com/ethereum/EIPs/issues/827
According to there, it is still unsafe and not suitable for use.
Hmmm.. I see so this seems to have been tested on ropsten or other testnet, but can't be used publicly yet? I'm still learning about this erc after the post above and I'm very interested about this. You guys can read more about it here: https://medium.com/bitclave/do-not-pay-transaction-fees-in-ethereum-21a9dccaaf63
Their github discussions: https://github.com/ethereum/EIPs/issues/827
According to there, it is still unsafe and not suitable for use.
For others post, I'm sorry I can't reply one by one.