u/aimixin - originally from r/GenZhou
Maximum wage is a bad idea since rich people don't even make most their wealth from wages but from capital gains. It really only hurts working people and demotivates them from working harder. Cuba had a wage cap system but abolished it because it wasn't working out very well. Combatting excessive wealth is more about combatting capital gains and not wages.
China also has a strange system where some of their taxations on capital gains are social norms rather than actual laws. For example, rather than setting a profits cap, there is a norm that companies are expected to donate excess profits. Tencent, for example, literally donated 3/4th of its profits to the government for social welfare programs. There are tons of these social programs, but one is even direct cash transfers, which has caused some to compare China's system to Robin Hood.
Currently in China, social spending has been on the rise, wealth inequality has been on the decline, and the rural-urban gap has been declining as well. So the current policies are so far working to combat wealth inequality.
China still has a lot more work to do to combat inequality, but currently they are making positive progress and have been for some years now in reducing it. A lot of this data is somewhat outdated as well. In 2021, Xi vowed to crack down harder on "excessive incomes". So this trend of declining wealth inequality may have even sped up since then.
The minimum wage in China is constantly increasing, and has been hiked even more recently with Xi's common prosperity push.
As for a wealth cap rather than a wage cap, maybe the CPC would do that, not sure. The CPC usually doesn't like to have radically different policy changes, so if it tried it, it would first experiment with it on a small scale, and then decide if it's worth pursuing from there. There is currently an ongoing small scale property tax test. They might expand that policy depending on how it works out.