A few generalisations in there about "pop-up" clubs.
I can only speak for Falmouth Community Youth when I say that they have some excellent coaches within their ranks, some of which are being encouraged to take the higher level coaching badges and at least one has managed at a higher level than most or all swpl coaches.
As ever with Youth football it is very much dependent on the quality of the VOLUNTEER who gives up his time to run a team. They should all be applauded for doing so. At this particular club the coaches do much more than teach football. They try to take an active role in the emotional development of their players as well.
Regarding why they were formed: They have been around for a long time in providing free football on a Saturday morning but over the last few years have organised themselves enough to start up some teams and entered them into the local leagues. They needed to do this because, of the local men's teams, only Wendron had a youth section. For instance, 2 only 7-a-side teams for U_10s in Falmouth/Wendron area a few years ago. At best offering football for 20 lads in the whole area! Without these "pop-up" clubs there would be minimal levels of youth football in the Falmouth area.
Finally, Falmouth Community Youth FC are fostering links with Falmouth Town with a view to Town possibly providing a pathway into mens football after U_16s. Mutually beneficial in anyones eyes surely.
Clubs such as this should be applauded for not only providing future players but also for getting children active and producing well-rounded young adults.