For most of my adult life, I've lived in congregate housing and I've always opened up my WiFi as a public service and never had problems. Yes, I know--I've been lucky.
Now that many routers are dual band, I am able to keep a secure network for myself and an open one for guests.
I do this for one reason--I deplore waste. No need for someone to spend $40/month for access when a neighbor has surplus capacity.
You are a goodhearted person. I wish more people had an attitude like you.