On desktop, clicking "Thank" sends thanks immediately, and the link changes to "thanked".
On mobile after tapping "Thank" the page is reloaded and a confirmation screen with a button is shown, and clicking the button reloads the page again and shows another confirmation.
Two reloads just to send thanks is too much. It should work on mobile like on desktop - immediately say "thanked".
See prior discussion about this at T49658: Thanks workflow needs further thought, T71636: Thanks: Implement an undo feature, and T71804: Thanks tool: How much does the confirmation button cost us?.