I've read this whole thread with interest as I both volunteer and manage volunteers (FT job at regional charity, we have high retention and application of volunteers).
I volunteer in 3 roles, 2 are local, 1 is ad hoc and 1 requires a block of commit (every other weekend for a term for example.) The 3rd role is an intense but ad hoc responsibility with a national charity. Support and organisation is 100% better with the national charity, but there was also more forms and training to get started. I volunteer because I enjoy it and I care about the causes. I'm busy, but Its something I make time for at the expense of other stuff.
It's interesting that many posters have said they don't agree with volunteering because it should be a paid role. And yet charities are constantly critisied for "wasting money on admin". As a charity you just can't win!
There's been a downward spiral for a while as people retire later, fewer SAHMs, and more expensive student tuition. Then covid meant a lot of stalwarts didn't return, often because health or social and driving confidence deteriorated. I also agree that the amount of training/paperwork/online logins can be off-putting. Some is necessary but it really needs to be kept in check.
Interesting though there has definitely been a cultural shift in the way people view volunteering. It's a lot more about personal wellbeing now rather than giving something back. It's important that volunteers feel fulfilled in their role but it's been taken to the extent that I think a lot of people forget volunteering is firstly about serving the remit of the charity, not providing you with a fun little hobby. The rise in social prescribing hasn't helped, and I'm constantly fielding requests from support workers who basically want me to provide social care or wellbeing days. More generally I've had some truly rediculous "applications", from people who expect us to bend over backwards to facilitate their day out and then are astounded when we aren't grovelling and grateful. There seems to be a misconception that charities should be grateful for any random offer of unskilled attendance, but in reality we don't need this. That's why volunteer roles are advertised in a more 'job like' way now. We might as well be upfront about the skills and commitment we need, rather than waste your time or ours. If its not a match for you that's fine, it will be for someone else, but I will always hold out for the right match because no volunteer is better than the wrong volunteer. Volunteers aren't "free" to a charity they take a considerable investment of time and money, so it has to be worth it. The "Big Help Out" actually received a lot of critism from NGOs as it perpetuated this idea that volunteering is just a random day of unskilled participation. But that's not volunteering, that's going to an event.