Earlier quoted context omitted.
Not a monopoly. They are dominant. Start using duckduckgo and other similar sevices. The internet is still a free market. If you continue to use their products you are just whining. Become the change you wish to see in the world.
How do you avoid google classroom when the school demands you use google classroom? This is the same principles as the Microsoft monopoly of the 90s and 00s, and that at least gives me hope
The problem is that the other vendors aren't all that great. If you really want to take Google down a peg, you need to build better products than they do. Or go offer assistance to their existing competitors.