Honestly, they just shouldn’t have added support. GNOMEs been causing problems for basically everyone else for a long time. If they want to do their own thing, that’s fine, but we shouldn’t but everyone else shouldn’t have to do extra work to accommodate them.
Other methods of data collection can be scarily effective. Stores have identified people were pregnant before they knew.
Very likely they identified you as someone that could have that condition, and you noticing the ads after talking to your doctor is a form of recency bias.
You can collect almost all the same data from traditional surveillance methods. Collecting and processing mocrophone data just isn’t effective enough to make up for the massively increased costs from processing it.