Sadly, the lock-in is pretty extreme… as is user inertia. Office 365 has made the problem worse as well, even if you have something like OnlyOffice that does a good job of compatibility with Office, it can’t sync with OneDrive.
If you collaborate with non-technical people, they will expect you to work in Office formats, and won’t even entertain discussion of any alternative.
OpenAI published a paper about GPT titled “Sparks of AGI”.
I don’t think they really believe it but it’s good to bring in VC money