There is a ton of evidence. Ask Snoop Dogg how much money he gets from streaming compared to CD sales. Look at how badly industry revenue has collapsed. It literally never recovered fully since Napster.
https://www.statista.com/chart/17244/us-music-revenue-by-for...
It is an industry that employs real people from artists to studio engineers to musical instrument and equipment companies to the bartenders at the venues. Those people are sharing a smaller pie than they used to before Internet piracy devalued their music.
In your opinion it's tyrannical. Sure, most certainly a non-violent crime against a wealthy corporation isn't on the same level as murder or assault. At the same time, copyright infringement is conceptually not that different from property crime.
You would want the police to arrest someone who broke into your home and stole your movie collection.
You wouldn't want to spend a year writing code for your micro-SaaS product and then have a hacker breach your infrastructure, steal your work and sell it on their own website.
It's really a grand piece of irony for software engineers that depend on enforceable copyright law to put food on their table to call this arrest tyranny. If nobody can go to jail or be fined for copyright infringement then I hate to say it but you are going to need to quit your job writing software and start driving a city bus or something.
Don't forget that Megaupload was specifically designed to enable piracy and discourage other uses of the technology. It wasn't a file storage service that could be used for legitimate personal use because unpopular downloads would be deleted. The company actually paid people via an incentive program to upload popular files that were copyright infringing. This wasn't just "YouTube is bad at playing whack-a-mole with DMCA claims," this was a company that was responsible for something like 4% of all Internet piracy all by itself and actively encouraged it.
It's not like they were a company that didn't have access to lawyers who could warn them not to do what they did. Kim deserves his fate because his own hubris invited it.