Colonial Master!

[Foxglove]

Limit alliances to no greater than 1/3rd total regions

People will always find ways around hard limitations such as that. You might as well say, make sure every realm can only have 1 or 2 alliances. Any limitations of that sort would just lead to creative work arounds. For example, having an informal block of 4 realms (e.g.) with realms 1 and 2 as allies, and then realms 3 and 4 as allies, with the armies of all 4 rotating in and out of the theatre of war or attacking from different sides.

Artificial limitations to diplomacy don't really work very well.

[Zakky]

At the moment, your ally's regions count toward 1/3 of your region count.

Which is a very nice limitation. If you want to defend yourself, there is no downside. But if you want to expand, you can sever ties with your allies to do so.

[Anaris]

I'm sorry, but I can't help but read that as "limit alliances to the size of my own alliance bloc". Lurian bloc members demanding a limit of 33% when their own bloc forms almost exactly 33% rings obnoxious to me, doubly so given they were what caused these alliance blocs to begin with.

Sorry, Chenier, this proposal's been on the table since long before the current Dwilight status.

If there's any particular situation that prompted it, it's the Cagilan bloc on Atamara.