This is the n-th cartoon of this bland style.

• The redundant shirt and speech bubble
• the lack of a proper punchline
• weird smile on the right dude
• fingers

This same style is popping up everywhere.

Look for style consistency, including lettering, colors, line thicknesses, character features (e.g. number of fingers, shapes of facial features)

There's no attribution as well. No artist does that.

Unless it's stolen, but again, the art style is very current AIesque.

Yeah same here, no idea how to tell this is AI made...

keyboard for me

If it looks like a sepia pip-boy cartoon, it's most likely AI. For some reason that's the default cartoon style it generates.