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Okay, suppose that the 4.0 license really came into effect on 2018-05-02.

But there was a period from 2019-09-05 to 2020-03-03, when the 3.0 license was not mentioned anywhere: neither in the TOS, nor in the footer.

It means the CC-BY-SA 3.0 license is still violated, and your rights were terminated automatically on 2019-09-05. These rights are not automatically restored after the violation has been eliminated.

In this case you must accept any takedown request related to the content published before 2018-05-02.

This answer is not a legal claim, it just describes my view of the situation for other users. But I'll probably send a legal claim later.

Okay, suppose that the 4.0 license really came into effect on 2018-05-02.

But there was a period from 2019-09-05 to 2020-03-03, when the 3.0 license was not mentioned anywhere: neither in the TOS, nor in the footer.

It means the CC-BY-SA 3.0 license is still violated, and your rights were terminated automatically on 2019-09-05. These rights are not automatically restored after the violation has been eliminated.

In this case you must accept any takedown request related to the content published before 2018-05-02.

This answer is not a legal claim and I'm not a lawyer, it just describes my view of the situation for other users.

Okay, suppose that the 4.0 license really came into effect on 2018-05-02.

But there was a period from 2019-09-05 to 2020-03-03, when the 3.0 license was not mentioned anywhere: neither in the TOS, nor in the footer.

It means the CC-BY-SA 3.0 license is still violated, and your rights were terminated automatically on 2019-09-05. These rights are not automatically restored after the violation has been eliminated.

In this case you must accept any takedown request related to the content published before 2018-05-02.

This answer is not a legal claim, it just describes the situation for other users. But i'll probably send a legal claim later.

Okay, suppose that the 4.0 license really came into effect on 2018-05-02.

But there was a period from 2019-09-05 to 2020-03-03, when the 3.0 license was not mentioned anywhere: neither in the TOS, nor in the footer.

It means the CC-BY-SA 3.0 license is still violated, and your rights were terminated automatically on 2019-09-05. These rights are not automatically restored after the violation has been eliminated.

In this case you must accept any takedown request related to the content published before 2018-05-02.

This answer is not a legal claim, it just describes my view of the situation for other users. But I'll probably send a legal claim later.

Okay, suppose that the 4.0 license really came into effect on 2018-05-02.

But there was a period from 2019-09-05 to 2020-03-03, when the 3.0 license was not mentioned anywhere: neither in the TOS, nor in the footer.

It means the CC-BY-SA 3.0 license is still violated, and your rights were terminated automatically on 2019-09-05. These rights are not automatically restored after the violation has been eliminated.

In this case you must accept any takedown request related to the content published before 2018-05-02.

This answer is not a legal claim.

Okay, suppose that the 4.0 license really came into effect on 2018-05-02.

But there was a period from 2019-09-05 to 2020-03-03, when the 3.0 license was not mentioned anywhere: neither in the TOS, nor in the footer.

It means the CC-BY-SA 3.0 license is still violated, and your rights were terminated automatically on 2019-09-05. These rights are not automatically restored after the violation has been eliminated.

In this case you must accept any takedown request related to the content published before 2018-05-02.

This answer is not a legal claim, it just describes the situation for other users. But i'll probably send a legal claim later.