There are three pre-requisites to escaping the messenger silo treadmill:
1. multi-vendor, open standard protocol for E2EE group messaging
2. reference open-source clients for web, desktop & mobile
3. reference open-source server
Wire is contributing to #1 and they have a high-quality iOS (OSS) client and OSS server. Their Android and web clients are less stellar, but exist and can be improved. The iOS Arm client will likely be enabled on M1 Macs. Wire is free for individual consumers and has a paid offering for enterprise teams (i.e. their business model is neither data nor charity), and they do not mandate sharing your phone number or address book -- only an email address is required.
The IETF standard is MLS and it will live alongside TLS, https://datatracker.ietf.org/wg/mls/about/. The team behind Wire founded Skype and contributed to the first patent-free high-def audio codec (OPUS), which in turn enabled WebRTC, the protocol behind most modern video conferencing services.
Matrix.org provides #2 and #3 and has stated that they will migrate to the IETF MLS standard protocol.
Since both Wire and Matrix offer both OSS clients & servers, and there is active multi-vendor development on an open standard protocol for E2EE group messaging, web & mobile developers have multiple options for open-source contribution. Matrix already supports federated servers that can be self-hosted, and they recently supported the FOSDEM online conference with ~30,000 attendees, https://matrix.org/blog/2021/02/15/how-we-hosted-fosdem-2021...
> The most unique thing about Matrix is that conversations get replicated across all servers whose users are present in the conversation, so there's never a single point of control or failure for a conversation (much as git repositories get replicated between all contributors). And so hosting FOSDEM in Matrix meant that everyone already on Matrix (including users bridged to Matrix from IRC, XMPP, Slack, Discord etc) could attend directly - in addition to users signing up for the first time on the FOSDEM server.