The OGL is set up by WOTC, which can be revoked whereas the CC is external and with less strings attached. WOTC made the right call moving both 5e SRDs to CC.
That doesn't make sense to me. Both Tasha's and Rising reference Xanathar's for the Artificer spell list, Forge supplements Rising, and the 2024 classes have access to Xanathar's spells without issue. Plus, 5.24 promises backwards compatibility.
D&DBeyond haven't brought the spells from Xanathar's to the new Artificer yet while they did so for the rest of the spells for that class. Give it a bit.