Hi- no, we work with pretty much any platform both on and off the chain. We're using Ethereum for the token economy, and for linking the encrypted data in IPFS to transactions (using Ethereum as a blockchain was intended- as a distributed ledger). In future could we migrate off Ethereum to another chain for that? Sure- we could move to EOS, etc- and the system would remain the same. Ethereum is just the validation engine, with the Oracle Service acting as the broker between any and all transactions and IPFS as the secure data store.