I have no idea why people celebrate this. It is replacing one feudal lord by another.
We don't need AI at all. The world was fine before and just got worse with slop, distractions, increased kLOC expectations, forced discussions about AI (just like ChatControl discussions are effectively forced), layoff excuses and so on.
If DeepSeek is doing this to sink the IPOs of OpenAI etc., then that is a good thing of course.