If companies could put ads inside our anuses do you think they would?

Companies would, and have, killed people just to make an extra cent. Of course they'd do this.
- So what you're saying is they'd only advertise in high-traffic anuses...
  
  So an anus printer?
  a picture is worth more than a thousand words. Now you can surprise your lover with the completely safe Printhole™! Using biodegradable inks, you can add that extra bit of spice to your sex life. Or go for the deluxe edition that is ribbed for yours and his pleasure. Installation is easy!

There is ads in public toilet, so sure, they'll put ads anywhere.
- There is even toilet paper with ads on it. Does that count as "ads in our anuses"?
  
  Depends on how far you push it in.

I recently added some Taiwanese porn sites to my wank rotation. And while some of it is good, many studios have this annoying habit of putting temporary tattoos of adverts on the performers' bodies, usually on an asscheek and on the lower abdomen. I can't read the ads, but I'm pretty sure they are for gambling websites.
- What the flying fuck?
  
  Yeah, it's really gross. Totally ruins the mood for me. Fortunately they're not hard to avoid

If you look at your poop in the toilet, then yes they will put ads in your anus. The ads would of course come out with your turds.
- Embedded into cheap food that then becomes an ad in your toilet. But for a “pro” subscription you can shit without ads
- Would they be like a sticker on the turd with the message, or more like a 3d printed brown thing?

Bruce Bethke, the guy who actually invented cyberpunk and wrote the story Cyberpunk, wrote a book Head Crash. In which the VR hotsuit includes a "ProctoProd®" for bass. Bruce's predictions have turned out more accurate than anyone else's.

You can bet your ass they would.
- Heck, they would shove them in your dreams if they can (and they will, using neuralink lol); and then find crevices on the laws to navigate through, like crabs side-walking to move forward.

no because you can't see up your ass
- But other people can. It's all about the target audience. You would actually get paid, to show ads in your ass, when someone has a clear view into it. People with ads up their asses are just the medium to deliver the ads.

They already shove ads down our throats, so it's not a big stretch of imagination to say that yes, they would totally stick ads up our arse is they could.

There's not much viewership, so it better be cheap. That's the only problem, though, if you're advertising the right product.

they would but it would probably be exclusive to colonoscopy equipment ads for Drs.

I read that with an extra "i"
In which case, yes if they can then sell you the drugs you'd need for the rest of your life.
It's like coca-cola + insulin, from a financial perspective , complementary investments.