if you are some asocial hermit living in a basement, who cares about neither real life nor digital connections, that may be true for you.
most people live in a society and engage in some communities, these have some means of communication and since it's 21st century, they are usually digital. and these communities are not centered around you and few dozens/hundreds/thousands people are not going to leave the tool they all know and switch to another tool just because you told them to.
if i lose access to my school's discord, my ability to communicate with my classmates and ask for a help or information on anything school related is going to be significantly crippled, to the point where i am not going to do that.