How much hotspot data usage is inappropriate?

Not sure where you are hearing that but it’s not true. A hotspot might get a lower priority than other devices in which case data would slow when there was demand from many other higher priority devices but that’s about it. 

@sandblaster Does that change if I am using one of those bandwidth renting companies? It was them who told me their users tend to get blocked when they use too much, and they were trying to move away from renting AT&T cell space because of it.

I’ve never heard of a bandwidth renting company. I have no idea what that is. I’m guessing you mean an MVNO that uses ATT’s network? If so, MVNO’s definitely get a lower priority than ATT customers and that is probably true for them no matter which carrier’s network they use. I’m sure Verizon and T-Mobile does the same thing.

Let us help you with hotspot data usage, @Zenoctra.

Thank you to our ACE @sandblaster for the input! 

We understand how important it is to stay connected! With our Wi-Fi Hotspots you are able to do so. The only time we slow down speeds at any time is if our network is busy. We may also slow it after you use more than 50GB or 22GB of data in a single bill period.

Wi-Fi doesn't count as mobile data use. Using hotspots on the go is a great way to save your plan data.

It's best to manage your hotspot data by setting up usage alerts. You will receive usage notification alerts when you reach specific usage thresholds. 

Let us know when you are ready to become a part of the AT&T Family. We will be happy to assist in any way you need. 

Clarissa, AT&T Community Specialist 

If it's unlimited, it's unlimited.  But you probably have a limit.

When I had an unlimited hotspot I used whatever I wanted when I wanted, it was never a concern. After 22GB, it was depriotized. That said I didn't run a home off of it, but I used it with no concern.

There are people with older unlimited hotspots that use over 1TB a month (over 1,000 GB).