Any store can enable tipping on the POS devices. Many stores that used to not traditionally operate off of tips have added the option.

Big employers don’t do it as far as I know. Have seen it many times in convenience stores or small grocery

Few weeks ago facing the tip selection screen at a liquor store here in LA, it clicked for me that this tipping thing has gone too far.

Likely not what the op meant, but food trucks and artist markets (square's bread and butter)

A food truck operator is providing no additional service than a McDonald's ignoring the choice of where to drive or park. They provide takeout with no delivery.

And then this started at food halls.

Similarly, for farmers markets, artists, and crafts; these are traditionally retail items, these items often retail on their website or at a gallery (there is an edge case of auction houses), but now there is at least a vendor option of having a tip screen.