(Please see comments) Alternatives to Signal if they exit EU due to ending E2EE

Like the title states looking for E2EE apps (Android and iOS) without going into much details or needs to be robust enough and easy to use for anyone and stable for operations that are susceptible to constant electronic warfare. I did some research and thought about replacing Signal with Molly and wondering if it will still work if Signal leaves the EU, but am also worried about its updates to patch vulnerabilities in a timely manner. I appreciate the help I am a “Jack of all trades and master of none” when it comes to these types of programs, but am also the go to currently in my unit since I am somewhat knowledgeable about exploits and attacks that can compromise systems would be great if there was an desktop as well (like Signal) and would also be nice if it was FOSS and auditable ( I know that’s kind of redundant ) I know it’s a tall order to ask but figured I would try. I really appreciate the help so much and hope I did things by the rules here and don’t get flamed if this has already been covered ( I searched but my skills with searching the fediverse is low