No one cared about the GPT store. Just like no one cared about Plugins. That was just marketing to show the technology is 'accessible' to non-technical people.
The question is how is this going to impact their API and the increasing demand for lower-cost, higher-performing models to be used by the masses? If they want to be like Google and keep everything behind closed doors for years that's their decision, but they need clear communication about it.