I’m running Dendrite, I expect the best compatibility as this is an official product.

Bonus points for optimising IRC nostalgia post for rendering in Lynx.

Some example video?

It’s an international agreement as per https://www.cloudflare.com/learning/dns/top-level-domain/

Ryanair no longer overbooks flights and in my experience just assigns you random seats (next to each other if you booked multiple tickets). If in doubt just contact their customer support.