[gregjor]

I would interpret this as lack of interest, or the apparent offer rescinded in slow motion. Many tech companies have slowed or stopped hiring, some have laid people off. The additional expense and paperwork involved in a visa (you mentioned immigration) probably doesn’t help. I would simply ask the recruiter to explain the delays, you have little to lose at this point. I would also look at other opportunities, because if a company wants to hire you they generally move that process along. Delays and lack of response might mean a face-saving way to back away.

[triyambakam]

For what it's worth, I experienced what OP describes, though a few years ago - so wasn't due to current hiring slowdown