No one is saying that your voice doesn’t risk getting silenced on Lemmy. If they are saying that, it isn’t true. Anyone risks getting censored anywhere they go on the web. (If it’s your own hosted server however…)

If you join a Lemmy instance server with your rule style, then you can post on their communities and not have as high a risk of getting banned. Once you venture onto communities hosted on other instances.

Since things are federated, things may get dicey for you depending on what you might decide to post, and on the rules of the other instances. (and the communities.)

There are rules and guidelines everywhere you go, and they re always changing when you go onto other servers and communities.