In response to some who are claiming Blocknet "simply" added Ethereum, comparing the integration to an html file linking two websites:

You are wrong.  From a strictly technical perspective (i.e. code): Blocknet doesn't integrate coins by adding them to its own codebase... Coins integrate Blocknet's code (xbridge) into their own codebase (thus enabling cross-chain communication).

Therefore, Ethereum itself has to add "xbridge" to their own codebase in order to become "Blocknet-enabled."  Blocknet may have had to make some changes in their codebase to make possible an Ethereum integration (regarding this, I do not know). However, it is ultimately up to Ethereum to become "Blocknet-enabled" by altering their own codebase with the "xbridge" code.

This is how it has worked for every altchain currently "Blocknet-enabled." And this is how it will work for any altchain in the future that decides to become "Blocknet-enabled."

However, Blocknet is using Ethereum's script VM in their code for their upcoming DX and smart-contracts. So while yes, both are getting features of the other, I am primarily speaking against the absurd claim that "Blocknet simply added Ethereum" (as if Ethereum had no direct say or role in the integration).