They are removing blogs whenever they feel like it. My first blog was remove so I'm now hosting my own sites.
Yes they will remove only one condition if you will not take any action when they will locked. means when your blog will locked by bots then take a action for unlock else after 20-30 days blog will be removed Thanks
Yes, they remove blogs all the time (but not for that reason, I think, mostly just because people try to monetise them contrary to the terms of service). You can host a blogger blog on your own hosted space just like a wordpress one, though: no need to use blogspot - and then you own it and are not bound by their terms and conditions and they can't remove it. The fact that they notoriously remove blogs is simply a reason to host it yourself, not a reason to use wordpress instead.