EzekielRaiden
Follower of the Way
Isn't Basic already a sort of SRD?
In a word? No.
It isn't legally an SRD, not in the way the 3.5 SRD was, which is the most important feature. You cannot use its material to publish a game of your own. In practice, it also isn't really an SRD, because it includes exactly 4 subclasses out of the...what, 38 available in the PHB? 5e "Basic" is a teaser, nothing more.