I used to create car counting task "trails" where I'd make a list of 10-12 gas station car counting tasks to make a little extra cash on a Saturday or Sunday. I just came to realize that they can sometimes be throttled to where they do "over sampling" so they introduce a ton of them into a region and then once a certain number have been completed, usually a small amount, then they all go away.
This happened to me on Saturday the 11th where I had planned 12 in my region. That morning, I started to accept my tasks one by one for my route and then once I accepted the 9th one, literally all of the tasks in the entire region/state disappeared. I had initially thought it was because I could only accept a certain number and then I could add more once I finished those. Unfortunately that wasn't the case. In the almost 2 years I've been doing these car counting tasks, this throttling never happened until now.
I've experienced throttling before with other tasks (checking stores for Samsung Pay stickers in the window and asking some questions inside), and those disappeared without any notice after I completed like 15 of them, so I got to learn the hard way about this method of over-loading tasks. They too weren't mentioned as limited as well.
I wish they would announce this in the guidelines window in the Presto app even if its vague saying something like "once a certain number of tasks have been completed in a certain region, then the remaining tasks may no longer be available" or something like that. Thankfully I haven't seen this for any light audits.
Then again, since I've been doing this only for a few years, maybe I'm still young to this process and many of you here have experienced it already.