Yes,I already had to migrate from Realm to MongoDB Realm and now again to another solution. I'm looking into Firebase Real-time database hoping they have more stability and is not changing the ownership every 5 years
I had same problem with deliverability of emails to Hotmail accounts a few years ago, they blocked AWS SNS IP email servers so sometimes were received but most of them directly sent to SPAM or never received. We complained Microsoft and their solution was to use one of their cloud email service or partner because the "black magic" of their AI filter. This is a shame