If it's not a meeting that you have any applicability to and someone asks for your input in the meeting, say so.

"Sorry, I don't see myself using this product/service/team - not because it isn't good, it just isn't relevant to what I'm responsible for/in charge of".

I feel like people treat meetings like this inescapable prison; once you're invited, you can never escape! It's bonkers. If you don't need to go to the meeting or don't have applicability… don't.

I work for a Fortune-listed company -- exactly the kind of place where attendee bloat thrives and I've never once had any manager or supervisor aggressively push back on my declines if they are valid.