yes, the time frame is limited enough that people can have an incentive to innovate, without being brutally oppressing. we're not locking civilization into the stone age for multiple generations while coros become filthy rich, it's just 20 years and then it's free game for everyone.

now, if it were to death + 75 years, or whatever inane number is copyright today, you'd hear a different story from me. but it is not.

Yes, because this is partly why everyone keeps working so hard to produce a revolutionary technology. This is also the way it works with drugs, we have just been through a pandemic and a lot of people made a ton of money over their inventions, rightly so.