Why don't we see more D.O.S. attacks on individual accounts?

A recent event reminded me of something that I've been wondering about for years:

Given the prevalence of "3 strikes and you're out" login pages, where if you fail to input the correct password 3 times, your account is locked and you have to go through a sometimes painful and always time consuming process to get it unlocked, why do we not see this emerging as an attack vector, either to just be a general pain in the butt or to specifically bother one person?

If I know the person's account name, which is quite likely on things like online forums, I can easily lock their account by simply entering the wrong password for them 3 times. If I do it from a public computer, or through an open wifi connection, it probably can't be traced back to me?

I don't think I'm exactly the nastiest person on the planet, so if I thought of this years ago, why is it not happening a lot? Maybe it is, and it's just too small potatoes to get press?

New shoes

I'm finally giving up on the Shimano cycling shoes I've been wearing for the last 3 years. They have had a rip up by the toe for about 6 months, and in the last week it's been getting a little bigger every day. I had thought to maybe stitch them, but the rip is hard up against the plastic toe section, and I couldn't get a needle through it even with pliers.

I think I could have fixed it with gorilla glue and a piece of patch material, but I didn't think of that before. I'll keep them around just in case.

So tonight I took the cleats off of them and put them on the Sette shoes I bought about a year ago when they were on sale, knowing that I'd need new shoes eventually.

It'd be nice to get some Lake winter shoes, but at $180 (if I can find them that cheap, they list for $240 and are in high demand so not often discounted), not this year. I'll just ride with the hunting boots I've been riding with when it's really cold, on platform pedals.