"- Take pictures and videos."
I made no assumption, as neither the app description or screenshots gave any hint of this.
However, BerniS' comment above does mention submitting images - so okay :)
"- Mount and unmount filesystems."
No, the "modify/delete SD card contents" permission it also requires gives access to the SD card - this one shouldn't be necessary, I think it's only used for mounting the SD card as USB mass storage when connected to a PC - this along with the "mock location sources for testing" permission makes me suspect it's just been left in from testing.
When it comes to giving unknown software rights to functions on the computer that is generally within 5m of me 24/7, I'm a lot less presumptuous - but then I am a cranky old git ;)