I’ve been an occasional user of the free SketchUp for Web for years (free desktop app before that).
I’ve tried to log on last night and access the free service but the option seems to have been removed. I could get to the “start modelling” button last night, but when clicked it just took me to my account profile and I could only subscribe to paid tiers from there. This morning the web search results are taking me to 404 error pages.