I've used Pinterest for a couple of years or more to save images of cars, motorcycles and houses and the ads are just as terrible for me. I almost never get on there anymore because of the garbage they are pushing on me. Just not interested and it ruins the entire experience to have to wade through these terrible ads that have nothing to do with how I use the product (or anything else related to my life).
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The suggested pins for me are just as irrelevant. I spent quite a bit of time marking each irrelevant pin and ad as such, but it didn't seem to help. I finally turned off suggested pins, but ads aren't optional.
I feel like ads on all of the big platforms started out as bad/irrelevant/spammy. They've typically gotten better over time as inventory improves but then again ads are in general spammy by definition.
I've got uBlock origin, but it doesn't block anything on Pinterest. That brings up a good point... on Pinterest it is hard to tell what is and isn't an ad because the only differentiator is the text below that reads "promoted by...". Everything else looks like a normal pin, except usually the content doesn't make any sense with my feed so I think look to see who is posting garbage so I can unfollow them and usually it turns out to be an ad.
-edit-
The suggested pins for me are just as irrelevant. I spent quite a bit of time marking each irrelevant pin and ad as such, but it didn't seem to help. I finally turned off suggested pins, but ads aren't optional.