Both are same. It was blockchain.info earlier which now have turned into blockchain.com. Blockchain.com was owned by some other guy who sold it to blockchain.info
You don't need to repeat it 
Again you are wrong. I haven't used the wallet but that's what I got from a google search.
Not necessarily that I was wrong, because I tried to register there, usually, websites would ask users to save seed keys before starting to use their platform. But here, they didn't, I signed up and nothing. We are both right.