Have had experience of using private donor... This has mostly been exploring and trying on a few occasions to conceive via a co parenting route. In my case not a pregnancy. However with one person it was a disaster so breathed a sigh of relief when it didn't work. This was probably my poor judgement as at that time had just found out my chances of conceiving were v slim. I had a low amh and found out had endo, had the op and the recovery took longer than expected. I was vulnerable, in a stressful job and couldn't communicate my difficult emotions very well with family and friends
However after recovering from op before ivf had met some genuine guys who really wanted to be a parent and it could have worked had my crap fertility had been ...well not quite so crap and realising my best chance was to go ahead with treatment ... I think it's difficult for broody men not in a relationship esp if surrogacy or adoption isn't an option. I met 1 such man with a really heartbreaking past who had so much to offer a child but couldn't let him take a risk on me with my low chances of conception. I didn't go exploring that route to counsel but it certainly opened my heart and mind to different situations and was a very searching time.Have several female friends ( some partnered, some not) who would love a family/it's now too late for them but definitely wanted it with all their heart. Its a great sadness. With treatment they d have had a shot, i throw everything but kitchen sink at it but with probably much lower chance. Ivf on NHS becoming even more of a rarity for couples now too.
Of course sites that are advertised as a co parenting site, like the one of same name, but are anything BUT are much more worrying.
I think money is a huge issue. Fertility treatment is expensive, many folks don't have the money but are desperate. Websites like pride angel ( this is where the couple in media story found their separate donors)advocate for using a fertility clinic for iui so all relevant tests can be done, but others on there will try privately based on building up a trusting co parenting partnership .....altho obviously this couple found sperm donor only arrangement. Of course it's not without its risks but maybe true of any road to parenthood.
Just a different view.
Not my go to choice though and fortunately can fund more treatment for myself......just hope I don't spend it all before I have success again.