Ecash can trivially be fashioned to work with any crypto (send mint crypto, dispense tokens). It's not exclusive to Bitcoin. There is already a Bitcoiner developing Monero Ecash and a bounty for it.

Doesn't matter. A mint can covertly print as many tokens as they want. Bitcoins fixed supply doesn't limit that in any way.

https://njump.me/nevent1qvzqqqqqqypzqmajvcqjcvqgxql9ftj4zs95d9t7n9uqnpqpmk357nvjrgn4h79mqyw8wumn8ghj7mn0wd68ytnsdae8getddahx2un09e3k7mf0qyd8wumn8ghj7un9d3shjtnndp5hgen0wf3k2tn0dejj7qpqqeraqwjgqv7an4l28pz4wtwvxeg4swrwyx7gmat7k45gfsysdggstfxxdq