Online brainstorming games can be an effective team building activity because they offer several benefits, including:

Increased collaboration and communication: Online brainstorming games can help team members work together to come up with creative solutions, encouraging collaboration and communication between team members.

Improved problem-solving skills: These games provide an opportunity for team members to practice their problem-solving skills in a fun and relaxed setting. 

Increased engagement and motivation: Brainstorming games are interactive and engaging, helping to keep team members motivated and focused.

Flexibility: Online games can be played from anywhere, at any time, making them an ideal team building activity for remote teams or for team members who are unable to meet in person.

Accessibility: Brainstorming games are often accessible and easy to use, making them an ideal team building activity for teams of all skill levels.

Boosting creativity: These games often require team members to think outside of the box and come up with unique and innovative ideas, boosting their creativity and problem-solving skills.

Overall, online brainstorming games can be a fun and effective way for teams to bond, improve their skills, and boost their creativity, making them a valuable addition to any team building program.