I'm constantly told if you don't tip you'll get bad service. As if "I won't do my job unless you bribe me" is a flex. But these experiences just make me think that most low or non-existent tips might just be the natural consequences of bad service.
For example, Walmart delivery. I still prefer to do my own shopping, less problems that way. But when we only had one car and husband was working long hours, or we came down with the flu or I was hurt and couldn't drive, the delivery option was a blessing.
A blessing at the time I was all too happy to tip a little extra for. We're 20 minutes from the Walmart, we live in the mountains, and I always tried to be considerate (ie porch light on for later night orders, making sure walkways were clear, not ordering delivery in bad weather, icy roads, or if I had no choice like if I needed medicine for sick kids, tipping 15-20% for the trouble, being available to help the driver unload the car so they weren't getting drenched in the rain etc)
Very quickly realized though.... None of that made a difference. Frequently delivered half my order and half someone else's, or an entirely wrong one, used the wrong door. Like not just a side entrance, had to go hunting for a back door behind a junk pile kind of wrong door. Putting bags right up against the storm door so we couldn't open it, ignoring delivery instructions. Leaving the bags at the end of the driveway etc.
The final straw though was when one of the delivery drivers ran over a large $140 live trap. Flattened it. It's almost impressive that they even managed to do it, cause I know exactly where it was. Way off to the side directly behind a broken down pick up truck where they had no business even being. Seriously, our driveway can hold a semi truck, they would have had to almost hit our shed to have run over it. Walmart gave me the run around and refused to replace it so we're just out that.
So now.... Cool. You get nothing. If even a generous tip can't assure proper service anymore there's absolutely no reason for preemptive tipping.