Even more of them if full nodes start rejecting the Ordinals Attack and the scammers are forced to use third party software to circumvent a lot of stuff...
I don't believe you can stop this without messing with consensus rules. Standardness isn't going to help. Binance essentially funds this, and Binance is literally mining. Newbies can buy and sell this nonsense using third parties, and maybe at this time it'll be worse, because we will have an inaccurate mempool.
At very least, creating and trading Ordinals would be more difficult or annoying. Some people would either give up or pay more to miner/pool to see their TX included which should reduce total Ordinals transaction.
I guess they'll change it again, but probably not during the holidays. If they don't upgrade the captcha, they can just as well end their free accelerator.
If they change the captcha, those spammers will probably find a way to bypass the captcha again.
They may add an extra requirement and not allow transactions that create output worth less than a certain amount to be submitted to their free accelerator.
They really should switch to different captcha provider which let owner of the website set captcha difficulty to very high.