Regarding curating collections of films.....I already have the "keepers". I've ended up with boxes of negatives and cine films from several deceased relatives, one of whom was a keen amateur photographer for over 40 years. The vast majority of the material I've ended up with is good, so I think the duffs have already been weeded out. I've got them all because nobody else in the family has the knowledge of what they are, or how to view the slides, how to scan the negatives. I am the only one who has 8mm and super 8 projectors and a (Wolverine clone) scanner. But they've already been thinned out by the original photographers, except for my dad's stash of negatives which isn't huge and is the most personal to me. Prints, especially older colour ones, can fade. Those negatives are pristine. Prints of me which have adorned the wall since I was a toddler have faded, but the negatives are in perfect condition.
What i've been doing while I wasn't able to attend my place of work, once it was permitted, was getting some of the boxes to my mother and another to an elderly aunt who can identify people and places in the photos...and write the details on the back of prints or on the sleeves of negatives. Where there are no prints I've scanned negatives and revealed family memories long forgotten. And I am perceptive enough to know that I don't know what people will be interested in, long in the future. What I've already seen is photos I shot myself as a child being dismissed at the time, only for the subjects to come to me 40 years later wanting to see them. Obviously the subjects of 80 year old photos are mostly long dead, but their descendants might at least want to see them. I've put together documents and photos about a great grandfather who nobody acknowledged as he was a gypsy. The family basically pretended he had a different background and when he died in the 1920s quietly forgot him....through these photos and some other documents I've been able to dig up his actual past, find a handful of photos and I even know where his grave is....hoping to visit that with my mother this year as nobody in the family tends it.
Quite what I shall do with all of this in the future is uncertain but I do envisage making some sort of digital version available to the two sides of the family, with relevant photos and data. I am currently chasing up leads to an arm of the family with whom we lost touch 40 years ago, where a relative lives surprisingly close by (15 miles)...all as a result of digging up negatives. I've also learned that "great uncle Brian" had at least two wives simultaneously and took the most beautiful photos of them, and wrote them lovely poems.
but what has all this to do with labs offering processing only? I suppose it would be one reason for the existence of separate scan only services.
I still think that there are people who don't fancy processing film, especially colour film, themselves.....but who have the ability to either project slides or to scan negatives and perhaps select a few to have printed. Getting wet chemicals out isn't something everyone wants to do. And even if colour film isn't *that* much more difficult that B&W it does need more chemicals, more space and more temperature control. And for a long time, colour processes have been standardised. In theory, any lab operated by someone who's competent with equipment that is working will produce the same processing results as any other similar lab. With B&W you have many more options in terms of developing chemicals, agitation regimen, what contrast you like and so on.