@Ca_Gi Suggestion: list free speech instances as well. If you're worried about some users taking offense, just mark them as "potentially offensive". Or put them in a separate page.
A lot of big Mastodon instances spread SJW propaganda, and censor free speech/free speech instances. It's bad, and doesn't have to be that way. There are free speech instances, that let you view everything, decide what to ignore yourself.
New users might be scared of the censorship on the "popular" instances. You could let them know that Mastodon is decentralized, and there are options for those who want free speech. Mastodon is free software, it is what you make of it.