Display the add-on for these products or categories except for these x category or y product….
SO you can single out products or categories NOT to display on…
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Hiya! Thank you for taking the time to create a Feature Request for this.
The way Product Add-Ons handles this is the other way around of what you are describing — you can specify categories to apply add-ons to: https://woocommerce.com/document/product-add-ons/#global-addons
With that being the case, you can also disable global add-ons per product: https://woocommerce.com/document/product-add-ons/#per-product-add-ons
We hope this helps!