It baffles me that a company like espressif wouldn’t publish complete API specs of their radio hardware . I could see why they may not want their proprietary so

It baffles me that a company like espressif wouldn’t publish complete API specs of their radio hardware . I could see why they may not want their proprietary source out there, as it might make it easier for competitors to make similar chips, but what is the downside to enabling someone to write software particular to your hardware? It seems like they would have everything to gain and nothing to lose from this? Anyone shed any light on the motivations here?