What does アレだし mean?


Context: the speaker is a little worried about giving her real name during
registration, and says,「本名そのままって いうのもアレだし。どうしょうかな。」

Because of the context, I understand the meaning in this example. But what
does 「アレだし」mean in general? When can one use it?

A secondary question (not sure if it's related to the main question): why
「いうのも」rather than 「いうのは」?

Thanks!

