People block each other all the time on here, trust me it will happen plenty more. It is nothing you did.

Partial list of reasons people block -
Demographics like age, gender, etc.
Arguments over politics, religion, vaccinations...
The want to talk only to certain people.

Or one that people overlook - someone is trying to hide their online activity from a spouse.

It’s gonna happen more unfortunately.

They probably read a comment from you they dislike

How do you know if you never interacted with them?

I doubt that's your first block. You just don't know it

It happens. Best to not take it personal or it'll drive you mad.

People have their reasons. Don’t take it personally.

Aw, you went and hurt someone's wittle feelings.

Good.

If you haven’t interacted then how did you figure it out and why do you care?