I don't fill those in because you just know they are going to use data for marketing.

I do for larger/expensive purchases. For example, I registered all our home appliances. I use a separate email for all warranty registrations.

Never. I give companies as little info as possible.

Never. Data privacy aside, I can't be bothered to fill out yet another form or create yet another account just for one item I purchased. I also can't remember the last time I had something break on me before the warranty expired.

So my printer can rat me out? Fuck no

I do not, because if my product brakes, I would spent more money traying to make the warranty valid, that and loss time. It's such a useless procedure where you do a little work for the company for free (give them info directly), when people actually can earn money answering actual polls.

Depends on what it is and what it offers. If the product is something unlikely to experience failure that would be covered(like a standard, basic Weber grill), then no. If it is and there are no additional offerings for registering, then no. I keep photo copies of my receipts so there is never a question about purchase dates or warranty expiration. If there are additional offerings, I weigh the need for them and if they are good enough then yes, I will.

I’ll add to this that I always buy the insurance anytime it’s offered. I accidentally bought it with a TV about a decade ago and two days after the warranty expired I was moving and dropped the TV(barely. It was about an inch from the floor an shouldn’t have had a failure from the drop). It would give audio but no video. I told them that and they still replaced it, free of charge, with a much better model. My electric shaver just died two and a half years after I bought it and used it every day: replaced for free with a better model. The insurances have paid for themselves at this point.

I want 0 spam in my life so I skip sharing info any chance I get. I don't register anything and I've never had that be an issue getting warranty work/replacement.