For Amillennialists: If Satan is bound now, how can he do so much? How is this any different from O.T. times?

Acts 5:3- “…why has Satan filled your heart…”
Acts 26:18- “…the power of Satan…”
1 Corinthians 5:5- “deliver such a one to Satan…”
1 Corinthians 7:5 - “…come together again so that Satan does not tempt you…”
2 Corinthians 2:11- “lest Satan should take advantage of us; for we are not ignorant of his devices.”
2 Corinthians 4:3-4- “But even if our gospel is veiled, it is veiled to those who are perishing, whose minds the god of this age has blinded…”
2 Corinthians 11:14- “…For Satan himself transforms himself into an angel of light.”
1 Thessalonians 2:18- “…but Satan hindered us.”
2 Thessalonians 2:9 -“…the working of Satan…”
1 Timothy 1:20- “…I delivered to Satan…”
2 Timothy 2:25-26- "...God perhaps will grant them repentance, so that they may know the truth, and that they may come to their senses and escape the snare of the devil, having been taken captive by him to do his will."
James 4:7- "Therefore submit to God. Resist the devil and he will flee from you."
1 Peter 5:8- "...your adversary the devil walks about like a roaring lion, seeking whom he may devour."
1 John 5:19- "...the whole world lies under the sway of the wicked one."