Patent application filing fees and the time you spend preparing the applications, primarily. Also the loss of privacy (name, etc. in application) in applying for the patent.

Edit: Also the risk that your application is rejected so that you don't get a blocking patent, which would mean anyone else can use the invention or even patent an improvement. An improver might even cite your rejected application in their applications for more draconian inventions, which could be demoralizing.

Nothing. And if you work for a big tech company, you will get "patent bonuses" for doing so.

Nothing but the legal fees from enforcing it.

Patent office, maybe? Patent fees?

I will contribute to the gofundme

Enshittification, Inc.