

Walmart’s not going to be a good model, there, as while the chance of abuse being the cause might not be 100%, it hangs out near enough 100 to know more than a few intimate things about it.
If you’re asking someone to collect your groceries, maybe pay them to do so. Tips are broken as a concept, so whatever there.
Won’t happen. Not necessarily the them not buying it part, but it staying popular at all. No site/program is too big for Microsoft to torpedo. Skype used to be the verb for voice calls before they got their hands on it.