I read this on telegram

The question is why Proton XPR isn't really being adopted on a bigger scale.
Answer is get:

Because the language barrier (programming wise) proton use C++ (CMIIW)
Other chain using my more simple languange than C++.
Even STOREX must change their programming so they can entered proton blockchain and it took almost a years to finish it.
That why Marshall and team create Metalchain base on Avalance so adoption much more easier. Also after metalchain live, protonchain will rewrite using avax code and become A-chain (CMIIW).