Which is why DMA only applies to huge, dominant companies (the complete list: Alphabet, Amazon, Apple, ByteDance, Meta, and Microsoft) and there too it does not apply to all technologies, only for those where standardization is important to enable competition. It's much more important to have at least some competition than letting dominant companies monopolise entire markets through 'innovation' with private APIs.
Which is why DMA only applies to huge, dominant companies (the complete list: Alphabet, Amazon, Apple, ByteDance, Meta, and Microsoft) and there too it does not apply to all technologies, only for those where standardization is important to enable competition. It's much more important to have at least some competition than letting dominant companies monopolise entire markets through 'innovation' with private APIs.