What are your opinions on children's school photos on social media?

The young fella will be starting school next September and we are going through the enrolment form.
One of the questions is regarding consent for photos being put up on the school Facebook page.

Now, I don't have Facebook but the missus does.
I was pretty adamant when he was born that I didn't want his photos going up on Facebook.
Once something goes up online, it is forever IMO.
My missus has / had hundreds of Facebook friends, and in my opinion, if you wouldn't be sharing a literal physical photo album of your kids lives with all of those people IRL, putting it up on Facebook is the next closest thing and I didn't feel comfortable doing it.

One time we were out walking and a lady neither of us knew, but knew my Mother in Law, came over to chat and complemented our young lad in the buggy and mentioned a photo of him she saw on Facebook (which my MIL had put up it turns out).
So not a complete stranger, but to me it is a very unnatural thing to think people you don't know could be perusing photos of your kids.

Anyways, since my wife and I agreed at the time when he was born, we've not put any photos of him online and that's been fine, but now the topic has come back up again.

My wife is less strongly opinionated than I am on this, and is worried that he might get left out of songs, photos etc. that the school post online and is worried about that aspect.
We hopped on their page this evening, it is full of videos, photos, pictures of schoolwork etc. - all there visible to anyone who wants to have a look!

Maybe I am a dinosaur in this respect but I think it is just really really weird, that we, complete strangers to any of the kids in these photos, could just hop online and see so much of their lives and activities etc.

Am I in the minority here on this or do others feel similarly?