Zil is not the only one project which has sharding. For example Pchainans some other projects have sharding too. They should compare all projects.
docs.elrond.com
https://imgur.com/TM16qq0
For the moment, ERD is a BEP-2 token and is considered a security in US. Once the mainnet will be launched in Q4, things will change.
So we can only store in binance?
Binance CEX, TrustWallet, Ledger, ...