How have you been running it? How did you make it interoperable?
The downside, of course, is that voice and video will not work.
Oh, and perhaps a ton of initial invitations, one for every conversation you have open.
There are open servers you can join, with the bridges enabled, but of course, that kind of defeats the purpose. At that point you might as well use a commercial, closed-source offering, as, ironically, a corporation with a large footprint you can sue. Average Joe with an AWS instance you might not be able to track down, should your data leak.