Analytics is there, depending on platform it's either opt-in or opt-out. Android is opt-out for now, desktop seems to be opt-in. Not sure about web.
web and desktop are opt-out, but it all is very minimal and redacts anything personal
- Dev who wrote Riot's Analytics
Also the latest development version adds transparency as to exactly what it collects
But I'm also not sure they need to have any of your data.
The riot.im client lets you connect to your own Matrix server rather than an "official" one, so they're not really able to monitor your usage or know who you are unless the app is phoning home.
Maybe it's collecting analytics data? Would love to know. I only use the Riot.im app on mobile and use other clients for desktop usage.