I have literally never downloaded pirated software since OS 9 went away and OS X became a thing. Open up your task manager and look at how many processes there are (Window, Mac or Linux) and ask yourself if you're going to notice the one extra process that is out of place.
As for files with extra extensions, this is why you should always set Explorer/Finder/whatever to show all file extensions the very first thing, regardless of what OS you're running too.
Just log onto mastodon.social and be done with it. That's the one that will still be running until the they turn out the lights on the service, I figure. And then go kick in a buck or two a month on Patreon to help defray development and server costs. (Not being the product is worth a donation by itself, I figure.)