Speaking of "coincidences," on December 30th I searched eBay for a NEC TurboGrafx TurboDuo game console and came across this:
Find many great new & used options and get the best deals for Dymo LabelWriter 400 450 Twin Turbo Duo 4XL Label Maker Printer Spool Roll Part at the best online prices at eBay! Free shipping for many products!
rover.ebay.com
Yes, that's a 3D-printed replacement spool for a Dymo label printer exactly like the one you 3D printed on our Creality Ender 3 a month or so earlier. Didn't you find it at Goodwill.with no spool?
Anyway, eBay's promoted search results still have to match your search. It's just seller's paying for priority sorting in search results. You always see them twice in your search results, once higher-up with "promoted" on the entry and again somewhere below with the rest of the results. This isn't a case of Google telling eBay you were on Thingiverse looking for one of these.