Its free and its end-to-end encryption is in a beta stage which you can opt to give a try.

You should be able to find an old computer for free to use as a server. Then all you have to pay for is your monthly fibre optics connection to the internet and the power bill to run the server.

Oh, but I forgot, it doesn't work with just IP addresses and http. So don't forget to pay for...

1. Registration and the annual fee for a registered domain name.

2. Getting a SSL certificate so your server provides https browser connections.

When Tim Berners-Lee invented the internet I'm sure he never envisaged how much money these last two outfits would siphon off each year.

cheers, Ian.