Biggest cost then would be electric. Older PC, probably…70 watts. So about 600kWh/year. Maybe about between $60-$150 per year.
Much cheaper than any hosting I know and bandwidth costs are absorbed into your monthly bill.
The real risk would be hardware failure. Hopefully you’ll have backups or a user base that won’t care if the instance goes offline for quite a while.
There’s also a risk of unexpected security vulnerabilities letting an attacker compromise your public facing machine to get into your home network if you don’t have it physically firewalled off.
Personally, I’ll just let someone else deal with all the hosting issues. I’d rather donate if they requested than deal with all of that indefinitely.
Ok but to balance it: it forces you to confront your own on the topic as well.
That would force you to selectively use it since often times reality is somewhere between our personal view of it and other opposing views.
Chose the wrong situation and you’ll both be crying in the corner with shatter worlds. Chose the ones where the people are truly disconnected from reality and perhaps you’ll change their lives - hopefully for the better.