Postage was discussed, but never developed. Some vocal community members wanted no fees, so the idea went nowhere.
There’s no way to network to collect postage (usage) fees for cMix messages.
It’d be nice to have, but co-nexx.us / app · GitLab shows 2 months of no activity.
Last time I looked, 1 in 4 rounds were failing in pre-comp phase. I don’t know how anyone could deal with that (especially on mobile, as that means 33% more attempts to transmit). And since people are getting elected anyway (too many open validator slots, etc.), the chances of getting anyone to pay for postage when 1 in 4 messages need to be resent are very slim (even if postage was implemented).
It’s the same as it was years ago - someone needs to fix the validator issue (and more), but the community is populated by types who have always resisted attempts to properly run the network and on top of that we have likely-minded voters who support these fanatics, plus validator pools and artisan pool runners who are all on their side.