Why didn't the other Central Powers have to pay reparations too? (Short Animated Documentary)

TL;DR

Bulgaria paid minor reparations, while Austria, Hungary, and the Ottoman Empire (Turkey) were exempted because they were too economically devastated or no longer legally liable.

Key Points

• 1.Bulgaria was the only other Central Power to meaningfully pay reparations. Ordered by the Treaty of Neuilly-sur-Seine, Bulgaria paid a small fraction of Germany's sum, plus restitutions in kind — coal, cattle, and other goods — but the Entente cancelled remaining payments in the 1920s.
• 2.Austria was formally told to pay reparations but the obligation was quietly abandoned. The collapse of Austria-Hungary made assigning blame complex; newly independent successor states like Czechoslovakia inherited Austro-Hungarian industry, making it politically impossible to bill them. Austria itself was so impoverished — one in three citizens lived in Vienna with insufficient food — that the Entente simply wrote off the debt.
• 3.Hungary lost 70% of its land and 65% of its population under the peace settlement, leaving it economically incapable of paying. After Romanian forces intervened and a puppet government was installed and replaced, Hungary was ordered to ship natural resources to neighbors, but no serious reparations figure was ever enforced.
• 4.The Ottoman Empire's reparations were rendered meaningless by territorial loss and nationalist resistance. The Entente reasoned that stripping Britain and France of Ottoman territory effectively paid them; the empire's remaining economy was so broken they expected to loan Istanbul money rather than receive any.
• 5.Turkey's successful war of independence under Mustafa Kemal Pasha resulted in the Treaty of Lausanne, which declared Turkey a blameless party in WWI. The Entente, unwilling to send more troops, recognized the Ankara government, abolished the old treaty, and formally cancelled any Turkish reparation obligations entirely.