It’s odd that some of Blizzard’s own domains aren’t even on the white list, e.g. the armoury site, the game guide, and so on. It makes zero sense that we can’t provide links to our own hero’s armoury pages without TL3.
I guess they consider some of their own domains unsafe then, even though they have complete control over what appears on them, because there are Blizzard-owned domains that aren’t on the white list.
Heck, I asked about all this back in July 2019 when the new forums went live. The thread devolved into embedded cat and dog videos rather than discussing which sites should be added to the whitelist.