I had mine replaced, as did my gf, didn't fix it. Tried rolling back updates (which become essential for apps) didn't fix it. Didn't ever have FB, or use special effects.
Their offer was a discount on a newer model, I bought a Moto 6 for less and it's been great...
The anecdotes are nice but Apple fessed up to slowing older phones, albeit blaming 'flagging batteries'.
https://www.independent.co.uk/life-style/gadgets-and-tech/news/apple-iphones-slow-down-old-models-smartphone-speed-ios-updates-a8121906.html
I had mine replaced, as did my gf, didn't fix it. Tried rolling back updates (which become essential for apps) didn't fix it. Didn't ever have FB, or use special effects.
Their offer was a discount on a newer model, I bought a Moto 6 for less and it's been great...