Tip Baiting: Fair game or F'd up?

Quick scenario... fancy video editing business regulary orders $150 - $200 of snacks, fruits, powerbars etc. They tip $10. I know them because they get bundled with a great customer, so i have to accept both. probably served them a dozen times over the past couple years.

Last week, their order is alone. $350 of high end flavored sparkling water. barely fits in a cart. They pretip 10%... it's a lot of work, but i have a van and hand cart, so it's possible for me. $43 makes it worth it. if I had no other options, I'd probably do it as low as $25.

took about 45 minutes , hot Florida sun, but got it done. customer over the top in thank you (1st clue there's a problem) The app paid $8. customer changes tip from $35 to $10

Do you think that's fair or wrong.

reality, no one would accept that order for $18. most shoppers aren't prepared. so they likely would have been accepted by newbie shopper, dropped , eventually app would pay an extra $10 to get it delivered hours later.

For me, if someone doesn't tip, no hard feelings. it's their choice, and many didn't know a gig worker was actually doing it when they ordered. I give them great service, just won't shop for them again.

but someone who knows and does this... they'll never get another shop from me. I'm successful at this for now, but there's some doing this just to put gas in their car