mqzaidi

Recurring subscriptions are live on paytm.com.

I remember this too. When sendgrid was ddosed, as a company that entirely depended on sendgrid to send mails (I had joined recently), we were affected too. Since then, we run postfix and use multiple email providers behind it, but ironic how a tweet affected so many people.

lets give them credit cards.

You should also run logwatch - it will show you all the attempts that keep happening on any public servers running ssh. I once had to look at a box compromised, which was then used to brute force other servers, and it contained a file with 100-200 passwords for other hosts it brute-forced.

Now that google fetches the images from its own servers once and then renders for all, would this even work?

quantom factorization, hilbert spaces, fourier transforms and error correcting codes, all of these would be found in any quantum mechanics 101 course, definitely far from unrelated.