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Why would they need anyone's permission to add SDC or any coin they wish to their blocknet?
From the 'How will it work' section:
An API implementing the XBridge protocol
will be incorporated into the wallets of
participating cryptocurrencies.
And because all cryptos are (or should be) open source, anyone can do that.
Which would require the users of each coin to vote with their nodes! thus it being a decision made by people to accept it or not!
I'm not really sure what you are getting at but you seem to be of the opinion this is a centralised decision. And to me that mindset tends to be a killer in this industry.
Are you sure there is a need for changing how participating coins' blockchains work? You could add a lot of functionality to the wallet and it would still operate in the same network with other vanilla wallets, no voting or forking would happen.
I'm not sure i stated there was need to change the way a blockchain works? Sorry if i came across that way. They will need to communicate however. Why are there only a few projects listed and a foundation being formed if it is as easy as you seem to think to create it, with their code as is. Why not all 500+ projects if people did in fact not have a choice to opt in/out?
This proposal is a circle within a circle in my opinion and it may not hurt anyone to be in or out although its being sold by a few as that is the case. Its still a choice and not one that someone can make for each community "weather they like it or not".