It was changed recently, now upvote works similar to lemmy/reddit (but also adds things to your favourites)
Boost is more for the microblogging side of kbin, it’s like a retweet. (also adds more reputation points but that’s not really useful for anything right now)
If you get arrested during a protest, they can force you to unlock the phone (it can be a felony to refuse) , so better not to bring it at all.