Comment by jeroenhd

With how much Mastodon.social tends to fall over when Twitter does something stupid (again), their rates are probably a bit too low for a more robust service like Signal.

Signal also intentionally doesn't store too much data, long term data costs will slowly grow over the years. I imagine for a bigger platform, costs can grow to multiples of the rates for Signal and smaller Mastodon servers.

€10 per year should be more than enough for most users, though, and it should be quite affordable for most countries.