...a lawyer-only shop that owns one or more patents and decides to sue. These parasites ...
"Parasite" isn't an accurate term here. A parasite is something that takes a free ride -- a tick that benefits from a dog's blood and gives nothing back.
The lawyer-only patent shop paid good money to the inventor for the patent and deserves every penny of royalties to which it is legally entitled. The price it paid for the patent was based on the entitlement to royalties.
If there's a parasite, it's the inventor who put an insignificant amount of work into inventing something obvious and took advantage of the patent system to get paid for it.
Whether the inventor files lawsuits himself or cashes out through a company that specializes in that, I don't see how it makes a difference in who is getting rich off of whom.
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