At they very least, I think short-distance flights need to be made way more expensive. Like a 70€ minimum ticket price on all flights.
There’s no way in hell we’re getting through the climate crisis when a German can pay 20€ for a flight to Mallorca and back, but pays 200€ for a train to the other side of the country.
You absolutely can, but trademarks need to be domain-specific. And the social media platform and the window system don’t have much overlap in their respective domains.
Another window system couldn’t come along and call itself “X”, but a microwave manufacturer very well might be able to.