Why does The Giving Block Support ERC-20 Tether (USDT) but not tokens sent via TRON, OMNI or EOS

The Giving Block supports the ERC-20 Tether (USDT) asset but The Giving Block does not support transfers via the Bitcoin's Omni layer, EOS, or Tron network. In order to successfully donate Tether (USDT) to a charity please be sure the assets you are transferring are on the Ethereum mainnet (ERC-20 token).