For me, because I bought 500 on-premise perpetual seats of BUDR and have paid maintenance on it for going on 6 years. I'd consider KSBR if i could do a one-for-one replacement, but so far the only offer I've seen from Kaseya involved a nebulous license swap that essentially moved me from something that I've already paid for to a subscription model. Yes, I get some sort of 'discounted' license, but not only do I have to pay for the KSBR module itself (??) but then I have to buy shadow protect licenses too. Not at all an equitable move, imo. I'm a small shop and can't afford to just throw away the substantial investment i've made.
I haven't yet decided what I'm going to do here - imo, Kaseya should refund my investment in BUDR if they aren't going to support it, so I could go use the money I invested to get my own backup product direct from the vendor. I purchased 'BUDR' - not Acronis or any particular 'back end' product - for Kaseya to kill that product because they couldn't make the relationship work, and then re-release essentially the same functionality (backup/disaster recovery) with a new name is really hard to fathom. Who is to say that same scheme couldn't happen with the main Kaseya framework or any other module we bought on-premises licenses for?