and why cant u buy them from any exchange...?
Why do you care? There's always a reason behind their actions, can't you stop asking such bullshit questions? There are thousands of reasons for someone not to trade through exchanges, it could be a domain restriction, it could be a transaction fee or anything else.
Don't be harsh mate , Maybe He is only concern because OP is a newly created account and already posted same question from His first post.
That sounds alarming when there are exchange that can offer easily buy dogecoin.
We have plenty of scam attempt here so there is no wrong delivering that question and for OP to answer correctly.