We need to hear the details of the proposal. If the proof of purchase token could be proven to be owned by a ZK proof but have no link to your on chain wallet, it could very well maintain the same OPSEC level as it currently does. It does broaden the attack surface though.
As long as they don't force the monetization model to all servers, users will be able to still use community run servers like those ran by the OPSEC Bible team http://nowherejezfoltodf4jiyl6r56jnzintap5vyjlia7fkirfsnfizflqd.onion/simplex-servers.html or your own self hosted servers. This is best case use anyway so for all those OPSEC maximalists, this is already the use case for SimpleX
Also how on Earth are you going to lob these criticisms at this vague proposal and them propose we use Session when session is likely their inspiration for an EVM smart contract monetized messenger network 
Did you not realize Session has an EVM token too? Also the reason Session and likely SimpleX cant use Monero is because it can't do micropayments and can't be programmed on chain. This is good for Monero, don't get me wrong, I would hate for Monero to fall like Bitcoin by trying to be everything and achieving nothing.
Session Token - Session Token
The future of privacy is powered by you.
