Greeting my friend,
The internet is just another tool, another means of communication, there have been many ways to communicate the tool is not important the communication for fellowship is.
The Holy Spirit is everywhere brother. The wind blows where it wishes, and you hear the sound of it, but cannot tell where it comes from and where it goes. The Spirit is everywhere doing God's will, search hearts and entering the hearts of every born again from above believer. PTL \o/
As you say my friend fellowship is important, where and how does not matter, but fellowship with other born again believers is essential for us all. As you say when ever two or three come together in Jesus Name, He is there in the midst of us. Again PTL \o/
You say ' Where two or three is together in this Revelation. It does not "have to be" Sunday at 10 am in my church or your church with a thousand people.' Important point here my friend, you and I do not have a church. You may go to a church, but you are going to a place of worship called a church, it is not a church, the building called a church is taken from the word 'kuriakon', it was introduced by the RCC and IS NOT a word found in the Bible.
The Church is the body of Christ, the ekklesia, that word is in scripture, we the born again souls are the Church, Christ is the Head of His Church, we are His Bride, He is our Groom, He will return for His Bride, the Church, the ekklesia, the born again souls from all across the world. PTL Thanks be to God.
Bless you brother, enjoy the fellowship.
Shalom