In your case, lemmy.ca says this about the instance you are on.
Lemmy.ca
A canadian-run community, geared towards canadians, but all are welcome!
Welcome to Lemmy.ca!
“Lemmy.ca” is so named due to it running the Lemmy software, in the Fediverse, and it’s geared toward Canadians, hosted in Canada, and run by a Canadian. It is, however, not at all restricted to Canadians, or Canadian culture/topics/etc. All are welcome!
We have some rules here:
No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia.
Be respectful. Everyone should feel welcome here.
No porn.
No Ads / Spamming.
That gives a fair amount of information about what is and is not acceptable on that particular instance. Looking at your local communities only should tell you a lot about the general character of the group, I don't use Lemmy (this is from kbin, hi) but it seems like your UI has multiple buttons to show all/subscribed/local feeds, so switch it to local and see if it pisses you off.
Telling who owns it is harder, I think that's often somewhat obscured for dox/harassment reasons. However, in this case the website shows at the bottom of the right-side column who the admins are:
admins: @smorks @crb
And now I see that @smorks noticed your post and hopefully that will clear things up ;-) Hopefully they don't mind being doxxxxxxed.