>>mikece+(OP)
Signal had 40 million active users in 2021 [1]. With 14 million in infra cost, that comes to .35 per user/year. Total expenses are about 33 million, so about .825 per user/year. All in all that seems very reasonable.
>>daniel+3P
Hmm but then how did they manage before asking for that 1 euro? There were a whole lot of years where it was completely free (yes before the Facebook takeover). Here in Europe we've only needed to pay once or so until it got taken over.
There must have been some kind of venture backing because there was no money coming in at all from users for a long time.