BigchainDB and CATA both have similarities like both have 'Capability of structured data processing', Cassandra is also competitor but its way behind both CATA and BigchainDB. CATA is still to be launched while other wo are in production.
IMO CATA is claiming too much features which are very hard to digest before its launch. Thats why they are not selling token since they know at this moment no one will invest in there tokens. Its a smart move as they have to invest from there own pocket.
The way these guys are moving I am sure no one will invest even after the project is launched. No updated info about the project and there is nothing on there social media accounts. Thats not the way how things move in crypto.