I've never been a JW, but I agree, there are many other organisations that offer a far better worldwide 'brotherhood' of like minded people.
I'm a member of Girl Guiding which has 10 million members in 146 countries. Scouting has even more members, possibly about 28 million.
These organisations are inclusive of all and unite people of different races, cultures and beliefs. I went on a Guiding trip to Switzerland this year and met Guides and Scouts from many other countries there. A couple of years ago I took part as a leader in an international camp, with 3000 young people from 19 countries, as diverse as Egypt, New Zealand, Kenya, Norway, Japan and Fiji. It was an amazing experience.
Guiding and Scouting provide opportunities for meeting others with shared interests, often leading to life-long friendships. Everyone has the chance to travel and explore, to gain skills, try new experiences and do something worthwhile for others .
These organisations, unlike the Watchtower, have a positive life-enhancing ethos and encourage young people to be their best and fulfil their potential. All whilst having loads of fun.
No wonder young JWs are not allowed to join Guiding and Scouting; given a free choice with no outside pressure or coercion, I'm pretty sure most would not choose the Watchtower.