usually it refers to policies which (usually unintendedly, sometimes explicitly) take from the productivity of younger people to finance older people. Because it is difficult to predict the future, the fear is that the unintended consequence is that this may take so much from the young that it robs their future. There are very good reasons to at least consider this as a possibility, because policymakers seem to make state revenue projections that are consistently overoptimistic. Also, programmes that were instituted as temporary often wind up becoming permanent and then also get mission creep; some programs that wind up being generational are instituted without taking into account demographic shifts, especially in fertility rates, etc.)

The lost decade in Japan is often cited as such an example, but increasingly we are seeing things like wage stagnation among <30 in the US and Europe that may also be the result of this (of course plenty of mainstream explanations abound as well).

Cost of entry is too high for new players

In EU regulations, there is often a trend to not exclude small businesses from costly regulations. The GDPR is a recent example of this, with no carve outs for organizations under a certain size or revenue number.

In the US and other English speaking countries, there are often revenue, employee count and public vs private carve outs for various regulations.

By not excluding small business and startups from costly regulations, they often stunt potential new businesses from developing in the EU.

Highly regulated environments are heavily biased toward huge and/or old companies because regulation is a regressive corporate tax.