What are your goals?
I would say it’s really a combination of the instances policies and their jurisdiction, and in terms of jurisdiction it also depends on where you live (e.g. you may have more protections under law if the instance is hosted in your country)
There’s also nothing stopping you from using multiple instances — siloing your interaction in different types of communities in different accounts on different instances. This may be useful if part of your privacy concerns are having all of your post / comment data on one account on one instance.
Edit: You can also use an email aliasing service to avoid even giving your email out. There are aliasing services such as Addy.io, Simplelogin (subsidiary of Proton AG), Firefox Relay (Mozilla), as well as some email providers which provide (iCloud, Proton, Mailbox.org to name a few)
I would also like to chime in regarding how the community is quite small, there are two (large-ish) Canadian instances but despite this there isn’t really a large francophone population here from what I’ve seen.
I think the western-anglo bias is in part because the community requires people to host the servers, for the community to even exist in the first place. Smaller regions (such as franco-canada, French speakers only making up ~24% of our population) will make up a smaller portion of the user base and likely found out about the App through other English-language resources.
Mastodon has a bit of a larger more diverse community, but it also has had the benefit of many more years of larger (but still niche) usage and arguably more severe issues with X formerly known as Twitter becoming a hell-hole.