For years me and my friends have a number of group chats in iMessage, and about a year ago someone started hanging with our crew who has an android. I suggested signal and was pleasantly surprised how much support I got in the suggestion, both from the iPhone users dreading going green and from the android user worried about being left out. A couple people even already had it even though they didn’t use it, just tried it out after reading an article etc. anyway fast forward to now and all our group chats are in signal, and it’s been great. It’s a fantastic app, the transition was as simple as sending an invite link to the iMessage chat. We even use the stories function now and again. It’s great, I recommend giving it a try :)

I had less luck trying to get my family to switch to signal when we went green, but there’s a lot more tech-challenged people in that group. However most already had what’s app for international use, and moving to that was super easy - i would still prefer signal over giving my contacts list to meta, but the chats and backups are e2e so I’ll take it over sms/unencrypted rcs