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>Curiously, I'm getting a lot of ads for products that I've already bought

Exactly the same thing happened to me. Prior to the purchase I had been doing a bit of web searches -- first for the family of products I was looking for (i.e. not a specific brand) and based on what I read I decided to learn more about one product specifically. Confident about its quality after having read a lot of reviews, I bought it shortly after I had began looking. Several days later I began seeing ads for the product and they kept targeting me for quite a while since then.

When I need something, I will generally research intensely and make a decision in short time. Sometimes the decision will be to not buy, sometimes to buy later and at other times to buy right away.

When I decide to buy later, ads are useful to remind me or to offer competing products which come out in the meantime since when I'd done my research.

Ads about something I decided I didn't want are mostly annoying.

Ads about something I have are always annoying. The only kind of ads which are worse are those for things which are so irrelevant that I've never even considered them.