The TDC Team is following strictly a safe data workflow. To test new features (e.g. within the writing of a smart contract), add-ons TDC is using backtesting ... as such is well known as a general method for seeing how well a model would have done ex-post. Backtesting assesses the viability of a strategy by discovering how it would play out using all relevant data (inclusive Meta Data).
The ""NFT Dummy collection so to say is the playground or sandbox where we allow that new processes to be learnt might go wrong. - As such TDS's Dummy NFTs are not for sale, more being used as past of an internal test environment to service artists, collectors and digital art lovers at its best.