Developing an Application

I have been looking at developing some applications on a couple of platforms.  

I looked a bit at the Android - and it wants $25.00 for a developer's fee.  If I pay a developer to create this app and he uploads it, I am assuming that he could at any point, remove it, etc?  

If I upload it though and then find out there might be a hidden feature that I do not know about or worse, he puts something in it, like malware.  And then Google bans my account.  

Besides the legal agreements, etc - is there anything else that I should look for / consider?

Thank you!