This thread is timely as I just listened to
The Stuff They Don't Want You To Know episode on tipping. I'm not into conspiracy theories but this is a decent listen if you are into podcasts.
Throughline also ran an episode on tipping a couple years back. Like everything else, eat the meat and throw away the bones.
PSA: This is an apolitical topic, so I don't want to hear shit about politics. Thank you.