Yeah, but they’re great at discharging the righteous indignation of people who might otherwise do something extreme like going on demonstrations or start campaigning for non-“moderate” political parties.
This way people just put their personal data next to a meaningless and powerless piece of text on a website alongside that of other people, get the feeling of release after having done something about what pisses them of, and won’t do anything further about it.
Petitions are the single greatest invention of the Internet Age to keep the masses dormant (Social Media would’ve been it if, it wasn’t that, as the far-right has shown, it can be used to turn some people into activists).
Having moved fully to Linux some months ago, I look at this kind of thing both with with a feeling of smug satisfaction and with cold chills of somebody who only now starts to fully realise just how massive, heavy and fast the incoming train they just dodged is.