Company A makes a product used by 60% of the world.
This, rightly, worries people. When Company C’s product (used by 3% of the world) switches to using the core of Company A’s product folks suggest people use Company B’s product (used by 5% of the world).
Plot twist: Company B gets ~all its money (hundreds of millions of $) from Company A.
Welcome to the sewer of monopoly, institutional corruption and surveillance capitalism we lovingly call The Web circa 2018.