I usually don’t try using coupons since many of the codes shown on websites don’t work, but I feel bad for not trying hard or smart enough. I’ve heard good things about Retailmenot, I haven’t tried it yet but I wondering if there are privacy trade-offs.
The usual measures, like avoiding their browser extensions and cookies, should keep you in the clear for the most part. The last time I had a code from Honey, Retailmenot, or Groupon work for a major site like eBay and Amazon was maybe in 2021. Stopped trying later that year. They’ve mostly cracked down on it in favor of automatic discounts.