webmoney added the WMX currency to be the official name used in their wallet to represent bitcoin
you can cash out bitcoin to a regular BTC address if your wallet has the proper KYC completed
you can keep WMX and convert to something like: WMZ (USD) / WMR (RUB)
references: https://wiki.wmtransfer.com/projects/webmoney/wiki/WMX
locals in Russia are able to buy prepaid cards WMR/WMZ and add it into their accounts to trade further
https://wiki.wmtransfer.com/projects/webmoney/wiki/Adding_funds_to_WMR_using_a_WM-card
https://wiki.wmtransfer.com/projects/webmoney/wiki/Adding_funds_to_WMZ_using_a_WM-card
charge backs are only possible with stolen accounts/money but their wallet auth systems are insane with preventive measures