Sorry, to clarify, when i say protocol I specifically mean the E2E encryption protocol.
Also, have you thought about asking your clients/whatever to use one app to communicate with you? Even if you get half of them onboard, it sounds like it would save you a lot of mental bother.
I wish , every company has their own app to use , they will invite you to their conference by default, asking 10 people on the call to change for 1-2 is not feasible.
Many of them cannot install any new native application on their desktop / phone without IT approvals or their vpn does not allow traffic to consumer apps like Hangouts . They also need to record for compliance , pre-Covid some apps like Webex are connected to their conference room bridges using dedicated lines and hardware etc
Family / friends do not use use biz tools , it not easier to convince Apple users who like FaceTime, messenger is popular in few countries , wechat in China , WhatsApp in other places .
It is easier install another app rather than trying to get your grandma to switch from one thing someone installed on her phone and she learnt to use.
Also, have you thought about asking your clients/whatever to use one app to communicate with you? Even if you get half of them onboard, it sounds like it would save you a lot of mental bother.