I haven't bothered with any of those for at least five years now. Beyond the low-quality factor, that so many of the $0.00 are Kindle Unlimited selections also made the freebies too difficult to dig through.
I did score a free book on one of my 'to acquire' lists once. ONCE. However, I was actively looking for that particular book, and got the pleasant surprise that it was free. I didn't find it by trolling for $0.00 books.
I do check the Kindle deals page every single day. Sometimes they'll have a special sale featured in the banner on top. The Daily Deals are also worth a look. At least once a week, they'll post something really awesome that's a recent bestseller or a book I've wanted for a long time. I picked up RF Kuang's Yellowface, the Goodreads best fiction winner, for something like $3.99 that way. So you never know what you'll find in a daily deal, but you do have to stay on top of the page if you're a frugal reader, like I am.
Some advice: Don't bother with the 'countdown' deals, and check the monthly deals like it says on the tin: Monthly. The former are invariably junk, and the latter doesn't have much turnover, day to day or even week to week.
= new reply since forum marked as read