From their blogpost: https://blog.beeper.com/p/beeper-cloud-and-product-roadmap > Everything changed in August when a security researcher reverse engineered the iMessage protocol. > At a high level, here’s our product plan for the near future (in very rough order, and very subject to change): > Add support for SMS, WhatsApp and Signal into Beeper Mini, using the same end-to-end encrypted client-side connection archit…
Beeper (Cloud) has been around for 3 years. It supports iMessage, Whatsapp, Signal and 12 other chat networks. We have 100,000 users on Beeper Cloud. We haven't had a single problem like the one you're describing. Not to say it will never happen.
Now you're replacing that with Apple's own infrastructure.
They won't like this and I really hope an eventual C&D from Apple, Meta and Signal won't affect the development of the Mautrix bridges.