The guarantee is that they will clone and extinguish most of the best bots/tools/services riding on top of GPT. It's what platforms overwhelmingly tend to do.
If your thing is a near-touch to GPT, depends on it, is of medium complexity or lower, and is very popular/useful, they will build your thing into GPT eventually.
On the flip side, if you're Salesforce and using GPT to augment something about a major product, you're not facing a serious threat of OpenAI trying to become the next big CRM company.
This process will work similarly to how it did with Windows, Google, AWS, etc.
The pattern will continue until no one needs anything. I am sure this company will eat everything. There will be no pie.
Also not only for ChatGPT, but there will be a timespan between majority of people are automated out of jobs and a a forceful redistribution of wealth happens (let’s call it socialism). It’s always a good idea to have that $$ to bridge that gap.