Actually they are not targeting big tech companies, EU made legislation to protect its citizens from being exploited in various ways, the big tech companies are targeting themselves by employing practices which aim to exploit users (including EU citizens) in various ways.
This entire thread is weird trying to blame EU when OpenAI has ChatGPT rolled out and Google does NOT roll out Bard. Then it is obviously NOT the regulations, but rather Google trying to do shitty stuff or just not being ready
The poster doesn't seem familiar with the DMA. A key point of the DMA is a framework to lay out objective criteria which can be used to identify gatekeeper businesses.
Given the timing of the most recent EU review plus where OpenAI was in its growth curve at that time, they simply didn't fit the criteria, which were written to allow companies as big as Spotify to escape the regulations.