Unfortunately, Meta’s ad business is so effective that they would need to charge hundreds of dollars per year for an ad free service just to keep revenue stable. I suspect anything less than $25 per month would be loss making for them.
They do offer a €8/month ad-free Instagram subscription in the EU. I'm subscribed, it's pretty cool.
And even then, they wouldn't remove ads since they'd want to add to their profits!
The last numbers I saw are almost 10 years old now, and then it was $65 per year in profit for a Facebook user, in the US, a little less for someone in the EU and almost nothing in most other places.
Are there new numbers that one can access? I can imagine the value has gone up, but hundreds of dollars seem like a lot.