They've essentially already done that. The TLD system is nothing but a license to print almost unlimited amounts of money. Companies have to protect their trademarks in dozens of domains that they have zero interest in using. It's a huge waste of money for many businesses.
.academy
.accountant
.accountants
.active
.actor
.adult
.aero
.agency
.airforce
.apartments
.app
.archi
.army
.associates
.attorney
.auction
.audio
.autos
.band
.bar
.bargains
.beer
.best
.bid
.bike
.bingo
.bio
.biz
.black
.blackfriday
.blog
.blue
.boo
.boutique
.build
.builders
.business
.buzz
.cab
.camera
.camp
.cancerresearch
.capital
.cards
.care
.career
.careers
.cash
.casino
.catering
.center
.ceo
.channel
.chat
.cheap
.christmas
.church
.city
.claims
.cleaning
.click
.clinic
.clothing
.cloud
.club
.coach
.codes
.coffee
.college
.community
.company
.computer
.condos
.construction
.consulting
.contractors
.cooking
.cool
.coop
.country
.coupons
.credit
.creditcard
.cricket
.cruises
.dad
.dance
.date
.dating
.day
.deals
.degree
.delivery
.democrat
.dental
.dentist
.design
.diamonds
.diet
.digital
.direct
.directory
.discount
.dog
.domains
.download
.eat
.education
.email
.energy
.engineer
.engineering
.equipment
.esq
.estate
.events
.exchange
.expert
.exposed
.express
.fail
.faith
.family
.fans
.farm
.fashion
.feedback
.finance
.financial
.fish
.fishing
.fit
.fitness
.flights
.florist
.flowers
.fly
.foo
.football
.forsale
.foundation
.fund
.furniture
.fyi
.gallery
.garden
.gift
.gifts
.gives
.glass
.global
.gold
.golf
.gop
.graphics
.green
.gripe
.guide
.guitars
.guru
.healthcare
.help
.here
.hiphop
.hiv
.hockey
.holdings
.holiday
.homes
.horse
.host
.hosting
.house
.how
.info
.ing
.ink
.institute[62]
.insure
.international
.investments
.jewelry
.jobs
.kim
.kitchen
.land
.lawyer
.lease
.legal
.lgbt
.life
.lighting
.limited
.limo
.link
.loan
.loans
.lol
.lotto
.love
.luxe
.luxury
.management
.market
.marketing
.markets
.mba
.media
.meet
.meme
.memorial
.men
.menu
.mobi
.moe
.money
.mortgage
.motorcycles
.mov
.movie
.museum
.name
.navy
.network
.new
.news
.ngo
.ninja
.one
.ong
.onl
.online
.ooo
.organic
.partners
.parts
.party
.pharmacy
.photo
.photography
.photos
.physio
.pics
.pictures
.pid
.pink
.pizza
.place
.plumbing
.plus
.poker
.porn
.post
.press
.pro
.productions
.prof
.properties
.property
.qpon
.racing
.recipes
.red
.rehab
.ren
.rent
.rentals
.repair
.report
.republican
.rest
.review
.reviews
.rich
.rip
.rocks
.rodeo
.rsvp
.run
.sale
.school
.science
.services
.sex
.sexy
.shoes
.show
.singles
.site
.soccer
.social
.software
.solar
.solutions
.space
.studio
.style
.sucks
.supplies
.supply
.support
.surf
.surgery
.systems
.tattoo
.tax
.taxi
.team
.store
.tech
.technology
.tel
.tennis
.theater
.tips
.tires
.today
.tools
.top
.tours
.town
.toys
.trade
.training
.travel
.university
.vacations
.vet
.video
.villas
.vision
.vodka
.vote
.voting
.voyage
.wang
.watch
.webcam
.website
.wed
.wedding
.whoswho
.wiki
.win
.wine
.work
.works
.world
.wtf
.xxx
.xyz
.yoga
.zone
Yes, I didn’t think of what they’ve done already. But they could make it worse and with Google’s help make it more difficult to find anything useful.