After Tinkercad shutting down, I would be wary of tying my workflow (or investing my time in learning) into software I didn't own. Not trying to spread FUD or anything, but it seems risky.
While I agree that all users are taking the risk you describe, I think they reason they are using the website at all is the hope that an online tool will increase productivity via features only an online tool could be expected to have. That trade-off might be unavoidable.