@
Red It could.
But it was the intention of the creator, @
Mike Macgirvin 
, for all his works to be under the MIT license. The current Hubzilla maintainers, @
Mario Vavti and @
Harald Eilertsen, certainly won't relicense Hubzilla under the GPL in any shape or form, otherwise they would have done that.
It isn't even worth doing so just to have code from Friendica. After all, Friendica's backend is
vastly different from Hubzilla's. Friendica is based on a mixture of ActivityPub and its own DFRN whereas Hubzilla is based on Zot with ActivityPub available through an optional add-on. On Friendica, your account is your identity; it doesn't have Hubzilla's channel model, nor does it have nomadic identity.
Red came to exist by Mike forking Friendica and
rewriting the whole thing against his new Zot protocol. Hubzilla hardly has any old Friendica code left over. So it's safe to assume that Friendica's code is incompatible with Hubzilla anyway.
Generally, there's nothing on Friendica that'd be worth taking over for Hubzilla. Not even themes because theming works entirely differently on Hubzilla.
Asking Mario and Harald to relicense Hubzilla under any form of the GPL is as likely to succeed as asking them to implement all kinds of proprietary Mastodon stuff to make Hubzilla more compatible with Mastodon and Mastodon apps:
Not going to happen.
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