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Really the name belongs to a bivalve and everyone else is ripping off an entire species. I'm tired of thinking people are going to be able to pay for their tube fare with a mollusc - only to find out after reading it's really some silly smartcard!

The FAQ mentions about the choice of the name Oyster - https://www.oysterbooks.com/help/faq

"Oyster takes inspiration from the famous literary line in Shakespeare's The Merry Wives of Windsor, "the world's mine oyster." All the pleasures of reading are yours for the taking, no matter where you go."

...which is precisely why it worked well for travel and cards...

Never heard of the site, and the travel card is UK only. So not too big a conflict.

Don't get why this post was being downvoted when I saw it. Trademark allows for similarly-named companies in different businesses. The point is to prevent confusion, not cause a land-rush to monopolize common words.