The clause that lets a product change the deal after you already agreed

Most consumer ToS are not a snapshot. They are a moving target.
The pattern is almost always the same:

“We may modify these Terms at any time”
“Continued use constitutes acceptance”

That is how price, data use, and arbitration rules change without a second checkbox.
I wrote a short plain-English breakdown of that clause, when notice actually matters, and why insurance policies and medical bills do not work the same way.
https://nexusdocs.ai/insights/can-they-change-the-terms-after-you-sign-up
If you have shipped a SaaS ToS, I am curious what you put in the modification section — notice plus cancel, or continued use only?