The irony is that a valid reason for in-house developers to not want to use an external product is concern about the long term support availabilty for that external project. You could make a case that this product shutting down is proof the in-house developers were right not to trust it.
I don't think that's totally fair in this case, since it seems they open sourced their software. But also, in general, I think NIH syndrom gets a bad rap. Sometimes a "worse" solution you control really is more reasonable compared to a technically superior solution made by an external company.
This exactly happened for the same product a few years - a real time push company called Pusher folder (or killed its major product) and everyone using it had to migrate.
Ive been doing this for 20 years and I have had to do several major migrations due to vendors doing all sorts of stupid things. Millions of dollars and so so many hours completely unproductive because a commercial off the shelf product was 'cheaper' to buy initially.