Botspam apocalypse

It might be enough for the request to require more resources from the requestor than from the server, even if it doesn't actually give the server any money. I mean the requestor probably isn't going to be willing to dedicate more hardware "horsepower" to taking your search engine down than you are to keeping it up. That was the idea behind Hashcash.

As for coins, the current Bitcoin hashrate is about 200 exahashes per second, down from a high of over 250 a couple of months ago, and the block reward is 6.25 BTC until probably June 02024. At a price of US$24000/BTC that's US$150k per block (plus a much smaller amount in transaction fees) or about US$1.25e-18 per hash. So your suggestion of US$3e-5 would require about 2e13 hashes. https://en.bitcoin.it/wiki/Non-specialized_hardware_comparis... says an overclocked ATI Radeon HD 6990 can do about 800 megahashes per second (8e8) so you're looking at about 3e4 seconds of compute on that card, about 8 hours.

Maybe one of the altcoins that uses a hash function with a smaller ASIC speedup would be a better fit, although I don't know enough about mining to know if there are any where GPUs are still competitive. Still, it seems like it might be more than a few seconds?

Guess the fraudsters were vendor locked lol.

I'm trying to figure out what I would gain by configuring my browser to use HTTP/1.1 only.

Uhhmmm, I beg to differ and so do a lot of very smart people with many more servers and users than you or I are likely to see.

As with most 'Oh, its' Simple - Just Do XYZ' solutions there are often very good reasons for not doing the 'Easy/Simple/One-Liner' and here are a few with yours -

Firstly - The '10 bux' could exclude a vast swathe of the poorest. Skipping a couple of Starbuck coffees vs. the local currency equivalent of whatever you are charging equating to a month's worth of food or being able to send at least one of your children to the local village school. I mean - your forum / site so you can gate it anyway you wish, I'm just pointing out that it could and would be exclusionary (perhaps unintentionally so).

Next Problem: Accepting and Processing the 'Good Behavior' deposit. Congratulations, you now need to become a Payment Processor and as such have certain legal requirements regarding payment details and storage and also tax returns. 'Oh, just Off-Load it to Stripe' someone might suggest. Do-able I guess but anyone who has taken payments over the internet will tell you that its a Royal Pain in The Ass. Also, now all a 'Griefer' needs to do is run a few dodgy cards through your registration system and 'Poof' there goes your payment processor and/or the fees go sky high.

Most ‘oh its simple – why don’t they just…’ overlook (or are not aware) of the many, many good reasons why greater minds than yours or mine haven’t already implemented it.

Sure – sometimes people do come up with novel solutions to old problems so theres no harm in spit-balling and I’m certainly not directing any scorn or ill-intent in my reply.