This is Like. Creating a New Shortcut Road with Own Funds, letting Public to use it for their convivence and finally, after few years, Start Charging Toll for same service!  

For example,

• Broadband Case: Switching to Airtel Fiber/ Jio Fiber ditching your Local Service Provider, without any service issues just for lesser pricing.
• Chinese Case: Deploying extremely bulk cheap prices at hulk quantity due to which Local Providers get down business and simply cutting off their hands. This is the Monopoly game. The Bulky provider will stand in the last and rule the consumers at price they will sell.
• These are business tact to destroy and disrupt whole market to rule in future after generating deliberate losses by company itself and investing same money in consumer dependency, which can later converted into profits from consumers pulling all capital back in 1-2 years.
• Well, some companies spend money on Marketing Budget and to bring new sales, but here these companies are directly giving discounts to consumers in order to generate a habit, ADDICTION.