That's the url of the hosted website, the actual repl for the code is https://replit.com/@UncleSamtoshi/Sats2Cycles. However, it wont work tipping that because that would be a self tip.

And if you run it yourself, it's a way to sell your cycles for bitcoin.

Yes it is literally buying tokenized gift cards. Its a cool way around not having to put in credit card info to buy some of their compute power.

What area of bitcoin do you think needs more builders?