App looks very similar too. But friends, other devs and communities aren't using it. Their privacy agreements seems to be much better than Discord, especially because their servers are located in Europe. But one should still understand this is not entirely private either. Note, I am not dunking on this service, just want to remember people to read privacy notices:

We do use certain service providers to process your data on our behalf.

Law & Order: We may disclose your information to third parties only if such disclosure is absolutely necessary to comply with a valid legal process, protect any person from death or serious injury, prevent fraud or abuse, or protect our rights, property, safety and interest.

If you wish to request deletion of any information stored on our servers ... Exceptions apply for the third-party service providers used to process your data as described in the service supplement.

We may also process your personal data to comply with our legal obligations, to protect our legitimate interests or the interests of others.

- https://stoat.chat/legal/privacy

An alternative could also be Matrix, which at least is decentralized: https://matrix.org/