I've had bad experiences with all of them, it's just the most consistent with FedEx. Out of the major services, I prefer USPS and DHL, by far, but even they still fumble things from time to time. FedEx has just been a consistent pain to deal with, across 3 addresses at this point. Plus, I happen to get off work and get home right around when FedEx comes through my neighborhood, so I've had the pleasure of seeing the lady that handles this area literally hurl every package small enough for her to be physically capable of doing so the 8 feet from the sidewalk to peoples' front porches. I buy a lot of small, delicate things. Do other couriers toss stuff around? Probably at some point. But I know it's a 100% guarantee it'll happen with this lady, so I'll take the "probably, at some point," over a sure thing.
If they don't deliver something to me and determine I need to go pick it up, their delivery hubs are also the least convenient to reach. One is across my county, the other halfway across the neighboring county, Both are at least 90 minute trips each way on public transportation, with a healthy walk between the last stop and their location. At least UPS drops things off a 15 minute walk away, and the post office is probably a 10 minute walk.
I wouldn't jump to compare Reddit to Amazon. Amazon may have operated at a loss for a few years, but it seems pretty clear that Bezos did have a roadmap to make it a profitable business and made decisions to make progress towards that relatively early. Reddit has never been a profitable business and has no real way to get there that doesn't alienate increasing numbers of their users. It's basically in a race to cut a deal that makes spez some money off the whole thing before the bottom falls out from under it and someone else is left holding the bag.
Even when Amazon expanded into categories and took losses on them, Bezos was able to do so knowing that it would damage other businesses that didn't have the deep backing needed to outlast him, eventually leading to many competing retailers in that sector shuttering and Amazon being able to raise prices and rake in money once there wasn't really another competitor in a given field. He might be a massive scumbag, but spez is a massive scumbag and an absolutely inept businessman. For all his assholery, the best case scenario for his legacy is driving reddit into the ground and managing to foist it off on someone else before they realize it's no longer worth anything.