Coming straight from /r/pokemongodev, this might be a priority to keep the accounts safe. If the game finds you having suspicious activity, which can be anything from scanning/botting to your gps lagging for a second and teleporting you 50 meters or just simply anything the server deems "suspicious".
Edit for people who are not devs: Do not play PoGo untill further notice, or your account is most probably getting banned real soon as we do not have captcha support at the moment.
Coming straight from /r/pokemongodev, this might be a priority to keep the accounts safe. If the game finds you having suspicious activity, which can be anything from scanning/botting to your gps lagging for a second and teleporting you 50 meters or just simply anything the server deems "suspicious".
https://www.reddit.com/r/pokemongodev/comments/4z5hb7/0350_is_the_end_of_scanningbotting/
Post removed, here's a screenshot: http://i.imgur.com/gTSZzA4.png
Edit for people who are not devs: Do not play PoGo untill further notice, or your account is most probably getting banned real soon as we do not have captcha support at the moment.
Edit2: More info, seems like they added a web view for the captcha: https://www.reddit.com/r/pokemongodev/comments/4z9mpo/apk_teardown_for_35/