It’s not too difficult to disable, but Firefox does push suggestions by default and has a revenue sharing agreement with Pocket.
"Mozilla Corporation" bought Pocket in 2017.
Per https://en.wikipedia.org/wiki/Pocket_(service) :
> On February 27, 2017, Pocket announced that it had been acquired by Mozilla Corporation, the commercial arm of Firefox's non-profit development group. Mozilla staff stated that Pocket would continue to operate as an independent subsidiary but that it would be leveraged as part of an ongoing "Context Graph" project.[6] There are plans to open-source the server-side code of Pocket,[11][12][13] with more than 50 repositories already available on the company's GitHub account, including their iOS app.
In fact, this little nugget supports my original post: “the commercial arm of Firefox's non-profit development group”
That being said, perhaps they should just piggyback off WebKit/Blink and save themselves a ton of resources.
[1] https://www.crunchbase.com/organization/brave-software