Canada here. Professional communication at work is done via email. Sending coworkers nasty memes throughout the day is done by iMessage/FB Messenger. Outside of work it’s all iMessage (or SMS with the two people I know who don’t have iOS devices). I don’t know a single person that has ever used WhatsApp.
I’m still running a DS414 filled with WD Red drives. I’ve only swapped out one of the drives as it was starting to have issues. I’ve considered upgrading for more features (Docker, Home Assistant etc) but can’t justify the expense just for “nice to have” instead of “need”. Realistically it only stores Linux ISOs that I get with Download Station.