When you use the official discord client, it only sends to your device whatever chat channel you have open at the time, and when you click on a different channel, it just downloads the last 20 messages, and downloads more when you scroll etc. If you bridge a discord server to a matrix server, it sends all of the contents of all of the channels in real time across. If the server had 50 channels, bridging it to matrix would be the equivalent of you having 50 official clients open, one to each channel. Hence the additional load on discord’s side to send you a lot more data than they usually would.

(Disclaimer: this is all conjecture based on a general understanding of how the systems work, I could be getting some details wrong)

Looks like the source is available to me if you click the GitHub link?

I’ve had a withings scale for like 5 or 6 years, use trendweight.com for a graph, I haven’t had any problems with it besides replacing the batteries every year or so

How often are you people screwing things up so badly that your servers aren’t reachable over the network and require keyboard/monitor access? This is basically only ever once for me for the initial OS install, and even then that can be automated away if I had to do it more than once every couple years