I don't speak for others, but why I don't like it personnally:
- You need an account to use the software. It should be optional, I don't care about deck library etc. so if there was at least a possibility not to register to get just basic tracking options, I would consider it. But since there is no 'personalized user experience' associated with the account, there's just no point
- The decktracker is just a plugin for OW, it's not an independant software. I am interested in the plugin, not the useless core OW package.
- There are ads
- Their collection of user data is (IMO) not worth the service. (Here is their page regarding privacy policy)
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Altogether, for me, is too much, it's very invasive for a "service" that is far from perfect. Surely HSDT didn't start as it is now (and to be honnest, I think it largely contributed to the state HS ladder is now - but it's not the topic here)