The downsides with Bing currently are:
1. If you're not prepared to be civil to a language model, you're not going to have a good time.
2. The image input feature isn't quite the same. Feels like descriptions are bolted in from a separate (GPT-4 V unless the Bing CTO was lying) model so it's lossy in a way straight from GPT-4 V isn't
3. Voice recognition and TTS are good but worse than what Open AI is currently using. Perhaps they'll switch since the TTS is new ? But idk. It's also not hands off like Open AI have designed their implementation.
The deal was $10B for 75% of Open AI's profits until Microsoft recouped this investment. After the investment is recouped, then they have 49% of Open AI. The deal included access to all of Open AI's model.
By building relationships with government officials and media, and using X-risk fearmongering to lobby for regulation that inhibits competition and locks in their dominant position.