Yeah I liked the idea of Uber at first because taxis have been shitty for a long time and Uber was shaking up that industry.
But then I learned that Uber wasn’t making money and immediately realized that they were just looking better than taxis for as long as they needed to to drive them out of business so they can be even worse, while providing even less than taxis companies do. At least taxi companies have a relationship with their drivers while Uber was just a platform for connecting anonymous riders with almost as anonymous drivers and handling the financial aspect of it (so that they control it all as middlemen with control of the wallet).
So now I just use taxi services when I need a ride (while cursing the state of mass transit in North America and GM plus corrupt politicians for their role in making this like this).
Similar story with hotels/airbnb, though they’ve made it even worse because they are affecting the housing market itself rather than just the luxury service of staying somewhere while away from home.
Whatever it is, I don’t believe paradoxes are possible (other than language ones that basically just confuse any attempts to resolve a statement or set of statements to true or false without breaking any physical laws or causality).
That said, I don’t think an unstable time loop would necessarily be impossible. Eg, you go back in time and kill your grandfather before your father is conceived, which results in you never existing in the timeline, which then means no one is there to go back in time and kill your grandfather, which means the loop disappears and the timeline snaps back to the version where you do go back, and it continually alternates from there.
Not sure if any future outside of the unstable loop would exist, I think that would depend on if there’s a higher dimension of time that these loops could play out over.
Or, if everything experiences the same present at the same time, it’s also possible that after the first loop, it wouldn’t go back to resolve the whole “killer pops out of literally nowhere” because it was in the past and no time traveler is bringing the timeline back to there, so it’s all in the past. Though I think in that case, you wouldn’t disappear after killing your grandfather. You’d just be an enigma that would require going outside of time to understand the origin of.
Tbh though I’m 99% sure time travel just isn’t possible (paradoxes or not), just a fun thing to think about. And no, I don’t consider quantum effects being symmetrical in time to be time travel, they are just cases where you can reverse cause and effect and still have a valid cause and effect sequence.