If the crypto court makes an unfair ruling, you tell everyone to never trust their judgement. Now they’ve lost credibility and nobody will want to escrow funds with them in the future.
Whichever court provides the most consistent fair rulings attains the best reputation and becomes the most utilized.
By contrast, if government courts make an unfair ruling, they’re still going to be in business tomorrow and there’s nobody that can stop their monopoly on broken justice.
Some people might argue that their western country has a fair justice system and that everyone should be glad to be subject to that system.
That argument would be overly generous to even the most fair countries, and completely falls flat in the many countries where corruption is rampant.