just as the pit and chain and dragon are symbolic.
they represent something literally done. but it is figurative language.
.................
satan is restrained from doing just one thing during the Messianic Age (Time of Salvation before the end) - rallying the peoples of the world against the Lord and Christians.
that's all it says. it doesn't mean he's bound and gagged and can't do anything else at all.
here is Jesus saying He bound satan (from preventing the spread of the Gospel, extinguishing the church or destroying the church, or from rallying an all out assault):
Matthew 12
Blasphemy Against the Holy Spirit
22Then a demon-oppressed man who was blind and mute was brought to him, and he healed him, so that the man spoke and saw. 23And all the people were amazed, and said, “Can this be the Son of David?” 24But when the Pharisees heard it, they said, “It is only by Beelzebul, the prince of demons, that this man casts out demons.” 25Knowing their thoughts, he said to them, “Every kingdom divided against itself is laid waste, and no city or house divided against itself will stand. 26And if Satan casts out Satan, he is divided against himself. How then will his kingdom stand? 27And if I cast out demons by Beelzebul, by whom do your sons cast them out? Therefore they will be your judges. 28But if it is by the Spirit of God that I cast out demons, then the kingdom of God has come upon you. 29Or how can someone enter a strong man’s house and plunder his goods, unless he first binds the strong man? Then indeed he may plunder his house. 30Whoever is not with me is against me, and whoever does not gather with me scatters. 31Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. 32And whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
Jesus not only said the Kingdom of God had come, He said He bound up (defeated and disarmed) the strong man satan, and Jesus was now plundering his (satan's) house.