I was using the word "expelled" in the general English sense, not PADI's particular technical sense, and since the dive center was a PADI resort before and was not a PADI resort after, and that change was not of their own volition, I think "expelled" is a reasonable word to use. They were not warned, they were removed from membership. PADI used the term "excluded" when they told me. What I'm not sure about but perhaps Gaz is (?), is whether the instructor, an MI no less, was involved in the running and/or proprietorship of the dive center. Since PADI do have a reserved use for the word "expelled", it is noteworthy that the instructor was taken straight to that level, all intermediate steps being bypassed. He really was found to be a terrible instructor - as I already knew from meeting several of his students.
His behaviour was not just "technically" a breach of PADI standards, as can happen when someone does something to harm PADI's commercial position for example, but was flagrantly unsafe and extremely dangerous. One student that I met, possibly his last before his expulsion, was extremely lucky to be alive. Firstly he nearly drowned, then he had severe DCS that necessitated several days of Chamber treatment. This was especially costly for him as he had been told that the dive center was a contributor to the Chamber, but it had in fact not made any payments for a long time and he was NOT covered. He may never be able to dive again. And all this was done at and by the PADI dive center mentioned. The instructor may have been banned for life, but AFAIK the dive center continues. It is no longer PADI and I trust it no longer claims to be, though as I'm not on that island I can't be sure.
What appalls me, and this is the point of this post, is that so far as I can tell the BTB have taken absolutely no action against them. They did not even bother to send anyone to the recent PADI members meeting, to which they were specifically invited. The head of the TG Association did go to the meeting and I know is aware of what happened at that dive center, but if he's taking any action against members of his organisation there he's doing it very quietly. THIS is what I mean by institutional failings, and they affect diving/snorkelling in the whole of Belize.