I think it can be considered a one-time decision based on probability. In my case, I know I don't expect to call a ride every other day, at most once or twice

I think it can be considered a one-time decision based on probability. In my case, I know I don't expect to call a ride every other day, at most once or twice a month (even less now when bars are closed – but that's an edge situation). I know the approximate cost of a ride, typically €12, surge pricing may go up to twenty. So at the most, I expect calling a ride to cost me €20 a month. That's less than what resident parking would cost for a car for the same month (a few years ago it was €9 / week). So the ride-sharing wins. I can think about this once and re-evaluate the situation every year. Yes, sometimes I may spend more on rides, sometimes less, but on average it's a cheaper way of getting around. So even though every time I call the ride it's technically a purchase decision in that I can decide not to do it and walk / bike / take the metro (assuming it's still open), it could be argued that I had already decided that in this situation I would call a ride. So no decision fatigue. Note that driving my own car isn't exactly a "decisionless" process. I have to think where I'll go, whether I'll have easy surface parking (free) or whether I'll have to purchase underground parking. Plus, bonus points for underground parking being paid by the hour, so now I have to make a decision every hour about whether I want to stay out (purchase more parking) or leave. Also, with regard to the data plan, we don't have those in France (that I know of). My plan has 40 GB and I've got it because it was cheaper than my older 15 GB plan. I know my usage never has me go above 3 to 4 GB. If an unlimited plan was available for a few more euros, that would be a net cost to me, for no practical gain in peace of mind or anything. I suppose not everybody has a "boring routine-based" life so this approach may not work in each and every situation.