Bet Claude could build that for you in 5 mins

Wouldn't necessarily bet on it... would likely need to use puppeteer or playwright and change the user agent to match the desktop browser. And even then, the various services likely change pretty regularly.

That said... could maybe setup a mitm service that does this for even $5/yr to manage various services... where that service takes care of updating their signon/cancel scripts. Maybe even a semi-trusted mechanical turk as necessary.