That's the point. If you successfully tackled those mentioned 3 roadblocks - which you will, if you keep following and re-verifying when Twitter asks for it-, so when you surpassed that, you can follow up to the daily limit, which is 800-1,000/acc.
Regarding to unfollowing: i've never experienced any limits/never got locked because of it and i do 800-1,000/day/acc
Yes it looks like that the magical limit for new accounts is below 50 following. If you stay under it you do not get the verification things
How's twitter TOS with mentions? I mean, how much can I post in someones tweets and what can I post to not get banned? Thinking about bots here, not one @mention 1 time a week. Maybe 2-3 mentions on big accounts each day, promoting my product?
Looking for answers, thanks.