mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

Administered by:

Server stats:

366K
active users

Resistance can be as simple as using certain terms:

"online video" instead of "YouTube video".

"online search" instead of "Google Search" (or "do a search" instead of "google it".)

"music playlist" instead of "Spotify playlist".

Do not give these company any free advertising by using their names.

Do not make them the default term for something.