I mean, you can't escape politics on Instagram if you're actively searching & subscribing to the topic. I think the point is, even if you just follow close friends on Facebook, your news feed is almost still guaranteed to have daily political posts/memes/ads. The lack of ability to post links & easily repost/share on Instagram deters those types of groups from posting clickbait in the hopes to drive people to their ad-heavy pages. Instagram is a refreshing break from it in that regard.