Despite the philosophical friction, there is an argument to be made for the deep value of the 2021 license. SketchUp Pro 2021 introduced significant backend improvements (the overhaul of the .skp file format) that allowed for better data management and classification.
While new ones aren't sold, some users still hold older perpetual licenses that were active during the 2021 release. Maintenance & Support Sketchup Pro 2021 License
While newer versions focus on cloud collaboration and iPad integration, 2021 was a mature, stable workhorse. Key features include: Despite the philosophical friction, there is an argument