"Hughes has sold my email addresses. Anyone else having this problem? "
I haven't.
"Hughes has so many problems, ie: latency;"
Not a problem but a feature of satellite communications.
"must close browser to get to next email account; etc.,"
They're working on fixing this annoyance; probably won't happen until sometime in 2021.
" it's hard to imagine how they stay in business."
Really? They're doing rather well, actually.
Have you thought about going with another email provider? You've had a lot of problems with Webmail; it may be time for you to go with someone else and get some peace of mind.