If you use pinboard.in and are unhappy with the status of any “modern” apps for sharing to, or accessing, your pinboard bookmarks - there ARE some apps out there:
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Dagon: https://apps.apple.com/us/app/dagon-app-bookmark-manager/id1508281140 - improvements going, developer is responsive
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Pinstachio: https://pinstachio.com - in Test Flight, might come to the Mac, developer is also very responsive
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Pushpin: https://apps.apple.com/us/app/pushpin-for-pinboard/id548052590 - needs some love, but recently the developer has made some updates