Isn't AirBnB an obvious hospitality company?
If you're a grocery chain and you contract out most of your technical needs then you aren't a tech company. But if you're a grocery chain and you hire and maintain a large technical team to provide you with various custom pieces of technology, you're both a grocery chain and a tech company.
This could be any piece of tech: from custom software to custom refrigeration systems.
AirBnB is not buying houses to rent, it's a web middleman.
Amazon does sell stuff directly, so it's retail not tech.
All these 3 companies are well categorized, WeWork is not, WeWork buys properties to rent, it's just that, nothing that Regus isn't.
You will. It's easy. There are thousands of non-tech companies around you. Your local grocery store, laundries, car services, barbershops, etc. They do not hire software engineers, they do not build internal tools. Some of them do rely on third party software, but it's different.
Pretty much every bank is a tech company nowadays. Insurances? Same thing. If Oscar or Chase fires all of its engineers, the business is dead. By my definition, a tech company is a company whose business won't sustain long without its engineering team.