Neeva was a solution in search of a problem and almost no one cared to pay to search for results worse than Google. Their situation was so expensive that it wasn't enough for Neeva to make any money to break even and cover their compute costs.
This is the entire race to zero, where Stability, Apple, Meta are already at the finish line with other open source AI models or on-device inference with consumer hardware already available. O̶p̶e̶n̶AI.com and other hosted AI services cannot compete against open source models or freely available models and that is why O̶p̶e̶n̶AI.com needed to cry to regulators to introduce AI licensing rules that benefit them over actual open source or freely available AI models; i.e regulatory capture.
I can see many of these lesser known 'AI startups' getting acquired or shutdown and the bigger companies in AI actually doing AI research still being around much longer. The big money in AI is unsurprisingly hardware and not the software. [0]