You consented to their being able to delete it when you agreed to their terms of service. It’s like if you hire someone to clean your home. Mostly they’re tidying up and dealing with dirt and dust, but if they see what looks like a used napkin lying somewhere, they will probably throw it out without first asking if you still want it - without that being stealing and without ever owning it themselves.
It may seem weird weird to compare useful content to a used napkin, but hey, successful business founder stereotypes do quite often involve have an idea written on a napkin…
I didn't consent to anything, I don't have a Twitter account. I'm talking about people who do. And they often mistakenly think their content will stay on Twitter forever, so they don't need to back it up.
Fair enough. By “you consented … when you agreed”, I really meant “one consents … when one agrees”, as is common in informal English.
Yes, it’s a mistake to rely on social media content remaining up forever, agreed. That’s separate from ownership. Backups are important even for data on a hard drive you physically own, since hard drives can fail or be damaged or lost.
It's shared ownership. You own it, but give Twitter non-exclusive permission to also use it.
This is why news agencies request permission from a twitter account before sharing a picture they took.