Just to expand on the phone thing because it amuses me:
In a past life myself and a few others had access to cell tower records for a specific company. As a research project, we applied what we would now call AI/ML concepts to sanitized data (basically all customer IDs were mapped to a different ID set and then the mapping was thrown away).
For poops and giggles I checked the tower nearest the local happy ending massage place. And, lo and behold, we were able to immediately get a list of everyone who turned their phone off for 30-60 minutes.
Make sure to actually understand how those “non-profit” websites and services are functioning.
It costs money to power servers and to maintain them. Most of the fediverse instances like to claim they are run on donations and so forth. But… think about how angry people get at the idea of tipping for ANYTHING and then wonder how many of those are throwing significant cash at your favorite lemmy or mastodon instance per month.
Everyone is always shocked when they find out how social media or a “free” vpn or whatever is funded and where there information is going. But hey, I am sure it will be completely different this time.