>Is there any catch?
Not really, other than some goys here are saying it collects data.
>It sounds too good to be true.
It is that good. Or at least, the best we have so far.
>Do you download it on your hard drive?
Most people do that yeah. Or you can download stuff to your seedbox and set up Plex there, so you can stream from there.
>How does it collect the data for the movies (the poster etc)?
Using "crawlers" and sites like TheTVDB.
>Can they delete my shit?
Nope
>I have cateopgotized the movies via directors can they do the same?
Yes.
>Can i watch the movies on my tablet, how is that even possible?
The thing about plex is that it has clients for almost everything out there, even SmartTVs. BUT, for iOS devices you need to buy their plex pass.
But in theory, with the correct setup, yeah, you can stream from your Plex server to your tablet.