How to know the quality of machine translation systems?

Question

Machine translation from one language to another

I know that there are various metrics to measure the quality of machine translation systems, for example:

• BLEU
  
• METEOR
  
• LEPOR
  

Are there publicly available results of metrics for popular translation systems?
for example such as:

• Google translate
  
• Yandex Translate
  
• Microsoft Translate
  
• prompt
  
• Apertium
  
• openlogs
  

Answer 1

deepl forgot;)
https://www.quora.com/Which-languages-are-Google-T...
learn with the help of assessors

Answer 2

The quality of machine translation is so amazing that neural networks understand you perfectly:

Answer 3

Transfer back and forth. And compare with your own eyes the original text and after two translations. It seems to me that it will be more effective than metrics that work in an unknown way, invented by an unknown person.