It depends on what you are using Discord for and replacing. While Steam has Video Sharing and voice and text chat, that is only part of what I use Discord for and it would be lacking for me, not to mention it isn’t all available in one place in the UI. For others all they did with discord was make a text channel and a voice channel and used it and then Steam would be a drop in replacement that they already have.
Going to add one more: Steam.
Steam has a built-in voice chat and chat channels for your friends.
It depends on what you are using Discord for and replacing. While Steam has Video Sharing and voice and text chat, that is only part of what I use Discord for and it would be lacking for me, not to mention it isn’t all available in one place in the UI. For others all they did with discord was make a text channel and a voice channel and used it and then Steam would be a drop in replacement that they already have.