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The FairPay component is more of a demo than an actual component. It shows how to use the
Paypal.svelte and BTCPay.svelte components. The FairPay.svelte implements a "pay what you
want" style of payments.
Why the $10 increments? There's a form of credit card crime called "carding" where people with stolen numbers test their cards on any purchase that is $1. They'll get large numbers of possibly valid credit cards and they need to test them. The best way to test them is to attempt a very small purchase, and if the purchase works then they mark the card valid.
If you allow people to pay any amount as a donation then carders will raid your purchase form and rack up $1 fraudulent charges. That may not seem to bad, but your payment processor will then charge you $15 or more to handle the charge back. Even if you offer to refund the purchase and they do no work. This means if you receive $100 of fraudulent charges you would owe $1500 in fees.
The easiest way to prevent this is to simply only allow increments of $10. $10 is too high for most carder testers, so this will deter them (at least until everyone does this).