Is it impossible to run a company without buying advertising from Google?

Google controls many of the ways businesses access customers online in the U.S., making it almost impossible to run a company without buying advertising from the internet giant.

As politicians increase scrutiny of large technology companies, Google’s lock on these digital relationships is becoming a potential liability, not just a lucrative advantage praised each quarter by Wall Street analysts.

Presidential candidate and Senator Elizabeth Warren outlined a proposal Friday for breaking up Alphabet Inc.’s Google — and Facebook Inc. and Amazon.com Inc. — because they have “too much power” and have “bulldozed competition.”