I set out to do a moderately-paced ~40km route on Zwift and unwittingly selected B Brevet's current route. About 20 min in to my ride, I was overtaken by the pack. I didn't set out with the intention or desire to work at tempo, but I couldn't resist the draft and the drop multi. It actually worked out great - I got through a full cycle of the multiplier progression about 3 or 4km from the end of the route, so I just let 'em go and cooled down to the finish.