I think they started in the late 90s when they were adding relic/memorabilia cards into packs, so that you couldn't easily pack search and determine there was a "hit" in the pack. So some are used as decoys instead of just having a white cardboard spacer in every few packs.
I first recall them in like Score Board packs (or something else unlicensed) that did draft basketball sets with Kobe Bryant on one side, and a different player on back.
Some are hits, some are not. They were still being issued in packs (especially Panini) to deter pack searching, as recent as a couple years ago. COMC even calls those extra wide base cards "Decoy Thick Stock" parallels. Even newer cards are numbered even without a relic may be extra wide. I bought a box set of Topps 2019 Art of the Teenage Mutant Ninja Turtles and every card in the set, base or inserts, was thick stock (except the sketch card).
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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