If it's completely open, local, and trustworthy, I would definitely use it as a database of my activities. To query for and find something you didn't bother saving, for example, or combine it with RAG would be incredible. Since it's screenshotting everything - passwords, sensitive information, etc. - it can in practice never be trustworthy, though.
Even the theoretical legitimate usage is just nothing I ever wanted, certainly not nearly enough to spend the cpu, disk, and attack surface on. The value is microscopic and the cost and risk are not.
I can think of no value in a mass of ocr'd screen shots that is remotely worth the cpu and disk cost of generating them or the security risk of them merely existing anywhere, even if the code to do it was gpl.
And the real problem is not me anyway. I use linux. But not one of my relatives I care about does. They are all going to have these terrible things. I can directly take care of a few of them but not most.