Yup, and that's completely part of the legal framework of the USA. They take advantage just like every other IP-owning company, including basically every tech company in Silicon Valley.
Sort of like copyright holders that have actively lobbied to lengthen (retroactively) terms. They have no moral standing against being stripped (retroactively) of their copyrights.
In other words, it's the law, not the companies, that are to blame. Change the law.
0: http://skeptics.stackexchange.com/questions/8146/are-u-s-com...