I think this is more of a feature request you should make to Roblox as a whole, since you generally link topics from #bulletin-board to roblox.com, so topics there should follow the rules on the main site. This includes link rules.
It’s probably appropriate to keep this as a forum feature request. Although the allowed links have parallels, Bulletin Board also allows GitHub which Roblox does not - topics are still appropriate to be linked if they have GitHub links despite this.
A couple of years ago I got cleared by Developer Engagement to post offsite links as required by a license in Bulletin Board - not saying my permission is also applicable to others, but it’d be worth sending them a DM regarding licensing linking for the time being without said links being explicitly whitelisted right now.
Site features should remain site features. DevForum should remain DevForum.