Those people should be using clients that don't use legacy DMs if they care about their conversation metadata being leaked. 

 Is there a list of those clients? I’m on the latest @damus 

 #Damus 
https://nostrcheck.me/media/708c9ac1181fa8b4a1457c784b8902a48928da4df99e275ec831f3f99416c81b/4f768a5d072af568aa4010bf78eb8d5d0a9efe7a6954f95a751d260e4f683398.webp