Mozilla VPN seems to be just rebranded resell of Mullavad VPN with Mozilla Goodies.
Mozilla Monitor seems to use https://haveibeenpwned.com/ (also as seen in Firefox desktop)
Mozilla Firefox Private Network looks like another Cloudflare Warp's rebrand (with litte good additions maybe?) seeing that it uses Cloudflare .
Mozilla Firefox is also losing it's usershare and Management division may force in future to ditch Gecko and adopt Webkit/Blink in the hope that it could bring more userbase (just my thought) to lessen maintainance and focus on revenue.
If it brings revenue for them doing this,then it is absolutely good for them , but we are slowly loosing the Original Mozilla as Company based on Philosophy.