Rebels have been blocking aid for the earthquake because it comes from areas controlled by the Assad government, as we read in Reuters:

A convoy from the Kurdish-led northeast destined for an area in the northwest held by Turkey-backed rebel factions – enemies that have fought numerous bouts of conflict during the civil war – was turned back on Thursday.

Sources on both sides traded blame for why the convoy didn’t cross, accusing each other of trying to politicise aid.
On Sunday a U.N. spokesperson said aid from government-held Syria into an area controlled mostly by a hardline Islamist group was held up by “approval issues”.

A source from the group, Hayat Tahrir al-Sham, said it would not allow shipments from government-held areas.