There are many bugs some are really old bugs that haven't been fixed to this day (like showing the wrong name if you type in duel chat, card text not showing or basic card/mechanics bugs usually with anime/custom cards). They (staff members, owner) will also be able to look up your IP/MAC address when you're signing up and logging in, they also get some personal information if you donate to them with PayPal.

In chat some players but usually staff members (admins, moderators etc.) or the game owner are rather unfriendly and passive-aggressive to people warning, muting or banning them if they mention other ygopro client names.

Most things in TDOANE cost real money (there was a time when most of that stuff was free but not any more because of the game owner's greed), you will also get spammed with messages and pop-ups to donate to them or to subscribe to their YouTube channels (BTW there is nothing wrong with donating but if you're constantly getting ad spammed to donate then it's just getting annoying). Reasons: The client and UI are slow and the colors of them are kind of ugly (bad design in my opinion).

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