No they’re not.
I really wish people would stop using this line, as there’s no evidence to support it. They’ve been doing 6 month promotions for a long time and every time people say “Yeah they’re in trouble with subs if they’re doing this.”
The reality is that these decisions are made months in advance, long before any earnings calls are made that show declines in MAUs or profits, so no, they’re not doing this in response to ‘sub problems’.