Discord is a great service, but it is extremely cucked when it comes to its management and data security.
What is a more secure and independent alternative?
Some that I have heard of:
IRC. This is a great standard, since it has been around forever and it's easy to run your own server. However, there are issues with functionality and many newer applications have more features that many won't want to give up.
Tox. This is a great little P2P messaging app. Extremely secure. However, the P2P makes it difficult in that you can't send a message to anyone who isn't logged on. It also means that your IP is exposed to anyone you chat with unless you use a VPN or route it through TOR.
Riot. This is a modern application similar to Discord, except it claims increased ownership of data, better privacy, and is open source. It's possible to operate your own server on it, but there may be loopholes I don't know about. You can also use one of the official Riot servers, which allows for very modern functionality familiar to Discord-users, but it's unclear who owns Riot and whether they are truly committed to privacy and free speech.