I think you are right (and you shouldn’t be getting downvoted, imho).

However, the “irrevocable” part is something they might not allowed to add in places with GDPR regulation like the EU… where users have the right to have their content deleted on request, in what’s known as the “right to be forgotten”. Even though, admittedly, not every service is compliant.

IANAL, but a blanket statement like that in the ToS might be a violation of the data protection regulations, unless they explicitly add exceptions at some point in the ToS.