The study by the German Centre for Integration and Migration Research (DeZIM) found that 21% of respondents reported thinking about emigration. Among Germans without a migration background, the share was 17%. Those who themselves immigrated to Germany were twice as likely to consider leaving (34%).
Can I ask what you mean with "highly restricted”? I don’t know about China, but Russia doesn’t have any harsh restrictions in place I have heard of. You got the problem that you cannot fly to many countries directly anymore and of course you need money to make it happen comfortably, but the money part is true for leaving any country. The bigger issue is as a Russian to get any sort of Visa for staying, which of course indirectly is caused by the Russian government itself. But I wouldn’t see that as restriction imposed by the government.