With current trends of surveillance capitalism and nickle-and-diming for every single useful feature, I can only imagine mind-uploading getting closer to an eternal torture than a pleasant afterlife.

Some interesting resources that explore this view, which also happen to fill me with existential horror at the prospect of being uploaded (especially against my will):

Tom Scott's video "Welcome to Life: the singularity, ruined by lawyers": https://www.youtube.com/watch?v=IFe9wiDfb0E

qntm's short story "Lena": https://qntm.org/mmacevedo

I can especially recommend "Lena". It's from the 'I have no mouth and I must scream' genre of horror.