I think ViaBTC is an honourable company. I have been using them since they first started selling hosted S9 mining with zero problems.
Bitcoin Cash is not a scam, it is the cryptocoin that will be mined by the Bitcoin ABC hard fork of the Bitcoin Core client coming August 1. It remains to be seen how many miners will switch from mining BTC to mining BCC (or BCH - I think they will have to change the symbol due to a conflict as there is already a BCC - BitConnect.)
The industry is taking the hard fork seriously. Trezor dropped everything to make sure their users will be able to claim BCC for the BTC stored on their Trezors. There is probably more bitcoin stored on Trezors than any other form of cold storage, so you can be sure the developers will handle the split properly.
Personally I think BCC will be dumped down below $50 or so on August 1 or 2 providing a buying opportunity if you are thinking long term. If you own bitcoin you already will have airdropped BCC to claim on Aug 1 if you have the private keys in your possession.
For counterpoint if you are thinking of investing in BCC read this article
The Myth of Bitcoin Cash.