Often the fine print says they can — but there are limits. Many terms-of-service agreements let a company update terms with notice, and continued use counts as acceptance. Still, truly one-sided or surprising changes, or changes applied retroactively, can be challenged as unfair or unenforceable.
Most online terms of service include a clause letting the company modify them, and courts often enforce those — with continued use treated as acceptance of the new terms. But that power is not unlimited. Changes usually require some form of notice, a company generally cannot rewrite a deal retroactively to strip rights you already earned, and terms that are genuinely one-sided, hidden, or surprising can be found unconscionable and unenforceable. The practical problem is that these changes often slide by unnoticed, which is exactly why the notice and cancellation terms are worth reading.
Often yes — many agreements treat continued use as acceptance after notice. That is why the update and notice clauses matter.
Generally not to strip rights you already earned. Retroactive changes and surprising one-sided terms are the most challengeable.
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