> I watch tons of bike races and highlights on youtube TV and then almost all my ads are for cars, generic laundry detergent, and obvious scam crap products, anything but something bike related

If I had to guess, niche products for niche interests have small ad budgets, but the random detergent ad buyer is happy to bid on anyone's eyeballs. You can't target ad buys that don't exist!

On the other hand, before I bought YT premium I was regularly getting ads for Chevron gas in Spanish (which I don't speak), and would be unsurprised if YT ad enshittification drove premium sales.