I’ve been a TrainerRoad user since it was in beta a long time ago. And for me, I use TrainerRoad 2 - 4x week, practically every week of the year (I’m currently at 944 TrainerRoad workouts). So the ~$89 / year I’m paying is well worth it. Plus the TrainerRoad team has continued to make substantial investments in adding functionality year over year, which I cannot say for other platforms.
Long way of saying that if you are going to train indoors on a regular basis, then TrainerRoad is really worth it.